Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87878dc7379689d…

MALICIOUS

PDF

50.7 KB Created: 2020-10-21 09:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 60b793b3898ff77f432ea8462493d74a SHA-1: 13caef62264af46cf43c4c72179feca923173934 SHA-256: e87878dc7379689d9013ecfe154ccf85618a26eee3b9dc4a23263149d60f833b
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=my+hero+academia+two+heroes+dub+full+movie In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f88bb62264b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f8ec1188728a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5f87ab6b20121.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/tozebifojutejumikiba.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/d02f4832501683.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/138303.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/bomuxetited.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/fibalosixerivapun.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_01_sfnt_off00006f67.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_01_sfnt_off00006f67.bin)
    • https://s3.amazonaws.com/wonoti/automobile_engineering_ebook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/78867328269.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/bitsat_2013_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/60204989752.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/delevifisotos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61afb165-8135-494b-936d-7d8188167fe4/lufik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b2dc26-d2da-49de-b25f-c6bded650647/manual_foot_powered_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/631ebea3-8f82-4fe4-bda1-e4cfdd43b60e/dufeguburajonujujokeduj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/paxobojolasizos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7806/7392/files/89478809445.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4945/1161/files/91171421849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9213/0983/files/install_apk_on_genymotion_emulator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6310/7480/files/molepibizikuse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0259/2935/files/practical_electronics_for_inventors_4th_edition_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8924/5861/files/english_common_core_standards.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5978/1023/files/steel_concrete_composite_structures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8587/9704/files/understanding_environmental_health_maxwell.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In extracted file (font_00_sfnt_off00005eee.bin)
    • http://www.gnu.org/licenses/In extracted file (font_00_sfnt_off00005eee.bin)
    • http://www.gnu.org/copyleft/gpl.htmlIn extracted file (font_00_sfnt_off00005eee.bin)
    • http://scripts.sil.org/OFLIn extracted file (font_01_sfnt_off00006f67.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off0000a6eb.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off0000a6eb.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEE 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off00006f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F67 5660 bytes
SHA-256: 83be8c9b8839fe6a640021b39c83ec229a7fd0f826f0dcc271d13eb6ae25fcaa
font_02_sfnt_off000082a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A4 10548 bytes
SHA-256: a3e73b5f0285daccb6dea1339af01e1d8f3e5774c5b4e03e3893995a5b1bf071
font_03_sfnt_off0000a6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6EB 16080 bytes
SHA-256: 8f6ddafd3b0ce2004b9503adf603897a58143e210ca714e8dcfcba1b249cf112