Malicious PDF — malware analysis report

Static analysis result for SHA-256 6795d65aea5b8385…

MALICIOUS

PDF

52.3 KB Created: 2020-08-05 06:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4c16d2687af9ae7965596d8d1663e20 SHA-1: 6ce3a8c8cae9d54e42c8d5fb9b357063fe1de1b4 SHA-256: 6795d65aea5b8385c37d5013aa34a8815c20a463dc895a89d1e8074229022e46
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain (ttraff.cc). This indicates a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=advantages+and+disadvantages+of+sexual+reproduction+and+asexual+reproduction+pdf
    • http://files.biljohnson.com/uploads/1/3/0/7/130738752/202044.pdf
    • http://files.graceandtruthec.com/uploads/1/3/0/8/130874055/wipizerumupu.pdf
    • http://files.dragonfirestore.net/uploads/1/3/0/7/130739253/826469.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/tosibewudegokalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5516/1252/files/viwajokavizujasoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6938/files/zogokoteg.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/45343514065.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/jifizuzaninogimoze.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/siroxerexomukopurubav.pdf
    • https://cdn.shopify.com/s/files/1/0438/1641/9488/files/apologetica_catolica_purgatorio.pdf
    • https://cdn.shopify.com/s/files/1/0440/2675/7270/files/sudajavuzo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0435/6076/3555/files/wufinilamimikenevotogep.pdf
    • https://cdn.shopify.com/s/files/1/0447/8690/9341/files/spring_batch_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/4552557057.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/terminal_commands_mac_cheat_sheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c75.bin
b44e0d8a4f452cf006978f11a742dec89d12f90f38e14a2e004f0f1cf414ff2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C75 5440 bytes
font_01_sfnt_off00009f17.bin
efa6f65a0b2046c75a99a4cba5cbafda1c84f64f20ad28bb3012ee4d4b1bc8aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F17 10636 bytes

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