Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d67f81a9e90ba16…

MALICIOUS

PDF

44.8 KB Created: 2020-10-25 15:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: c451b53ccdb8feea5f1234df42d348fd SHA-1: be413b1096d40b992de718fcb18329f11e11933c SHA-256: 4d67f81a9e90ba1616a63e4c585a2f64bf8434ee7731f98b73b772af791b7239
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=barron+v+baltimore+ap+gov In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f949625bd4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f8dcd2de3067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f88c48077f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f8c3d1499425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f8cc149de031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f91559eb9a10.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006fbd.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006fbd.bin)
    • https://cdn.shopify.com/s/files/1/0493/7534/6847/files/pattinathar_songs_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5043/4211/files/hack_wifi_password_apk_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0677/1356/files/sijibutov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239a0b81-a447-4d5a-82a6-5d285cd7b6be/68284974774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0efb0e0-de4d-4259-8900-5f85ad2e7e88/pukoxipabimimulesavanum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a3ba26-df37-4118-8e6a-49b7e0f02bdc/56456742871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c25842-725a-4061-a262-ea9a0408d55b/xepubizujepukotelosaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5a6d46-6c75-4e4f-9743-1e1d6ccceb18/fepufej.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/53440532506.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/jagujafafoxizezonopak.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/catcher_in_the_rye_chapter_20.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/tijibesubediz.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/zozabedusomasifotozipi.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/sociology_notes_class_12.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/92688437786.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/2d_game_tutorial_unity.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/fourier_analysis_princeton.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/xaxilutibawibuxatemeve.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
    • http://scripts.sil.org/OFLIn extracted file (font_00_sfnt_off00006fbd.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBD 5212 bytes
SHA-256: 91e60c56004ecaa8c59d6e78513b0178e797d093632280eae2b859a16aa441e7
font_01_sfnt_off00008165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8165 10816 bytes
SHA-256: f8a12a41a15f370c0240103ce5d3df477ee248a1d46312aa24039f74652188e9