Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a267a9eb756a6ed…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 02:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73f9080501520675308375cda5f11bae SHA-1: 89e75b76995c8e408344974ae95cf453ae12eebe SHA-256: 0a267a9eb756a6edbf414eae88d2959e692ceb4a5ecb3695794306d03fe053ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded links point to a malicious redirection 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/wix?keyword=average+female+thigh+size
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/agriculture_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/70873055550.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8501/files/59608677341.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6566/files/doxikokafofoxajaxanugedat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0446/files/bhagavad_gita_ita.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/kexanobabogabu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/5294827524.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/little_nicky_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0440/1473/1429/files/79875123760.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2557/files/anderson_s_business_law_22nd_edition.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f949fd4c32245dea35cfdcd393a6c3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_aea8e53dc91445bc9d722d7427837de9.pdf
    • https://static.usrfiles.com/ugd/20d83a_28f6e0f8cf88439eb43471469f81146b.pdf
    • https://static.usrfiles.com/ugd/df4650_083b161dc723429fbb96e5fe76994a1e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006538.bin
62edf30433d5b8590afcac64c82b86e55e122facf922df4593ef0fbaa1c6b8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6538 4908 bytes
font_01_sfnt_off00007688.bin
a71427deccef6cba5b2cec738361fda817ade324c13d138e0d94ffeeafc08812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7688 5280 bytes
font_02_sfnt_off0000886a.bin
33fd3d212ab4e8fe35c95acfdf9baf9695576311ca382f2fdc416e1a9cea89d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886A 9796 bytes

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