Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9560cd74ed72e3…

MALICIOUS

PDF

35.8 KB Created: 2020-10-29 07:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 2b6a39bb08303d572c6e4ad70df074ef SHA-1: 53a0255bc679e413fa394392d522931d4575e593 SHA-256: bc9560cd74ed72e3c0b8a4f2c5b656c62f3b729537bcdc370c363557a1903e15
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://ttraff.me/pify?keyword=ballroom+dance+studios+orlando+fl In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5f93a748b70bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5f99e0dfcebcf.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/tuweno.pdfIn PDF document text
    • https://tilafiranude.weebly.com/uploads/1/3/4/3/134314128/novemuk_zabuvadizotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004f87.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004f87.bin)
    • https://s3.amazonaws.com/wilugugo/beethoven_piano_sonata_23.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5535/2481/files/78515354484.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/tedozizapudogibuvodepowi.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/14831277470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2474/0252/files/66680691327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/7687/9271/files/finukuzilalaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fcbfe2d-0164-49cf-bbe5-8c9bfac48ac0/98881354311.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/array_1_codingbat_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8940a3c-f940-41aa-a38e-95872baaf6c1/70107686568.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/tekegelifeved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84e3099-016e-4c2a-b50e-6138854ca68a/36279547302.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/wadizitubosamafid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af37402-1181-44df-a132-625a9beac3c7/57850485677.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/neoplasia_pulmonar_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/bipedestacion_definicion.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_off00004f87.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F87 5216 bytes
SHA-256: dbe873f63a1217397d92cefcf121e5e8f7dc23970c84494af41563d96ad3a9de
font_01_sfnt_off0000612b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 9660 bytes
SHA-256: 3b5a5c3925cbbd36108fa79592b9db47c026c19e9493e24d64d88ba1ef093c51