Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bec5788371f9e3…

MALICIOUS

PDF

43.2 KB Created: 2020-08-11 21:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7c6ba5c544b3d7f06e03c578713770 SHA-1: 52c938cb1722d1b79f151a9249acdba756e7f1e6 SHA-256: f5bec5788371f9e3ed7f5c75c2da7159ca4ce3547496f0a5320bf0836e67e10f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and appears to be part of a link farm strategy to distribute malicious content.

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=the+aeolian+islands+volcanoes+pdf
    • http://files.lasertoenailsanfrancisco.com/uploads/1/3/1/4/131453421/tupemuf.pdf
    • http://files.barboursvillemoose.org/uploads/1/3/1/3/131382808/51a2a.pdf
    • http://files.stpeterchurch.com/uploads/1/3/1/0/131071243/8477545.pdf
    • http://files.beulahmay.com/uploads/1/3/1/8/131856446/80bf8b942c07.pdf
    • http://jivagi.mariefmartin.com/uploads/1/3/0/8/130814310/zixikumaku.pdf
    • https://cdn.shopify.com/s/files/1/0434/6960/2978/files/khng_m_c_file_trn_my_tnh.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/77260086306.pdf
    • https://cdn.shopify.com/s/files/1/0437/3689/1544/files/jokutudewijugiruxujepevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8342/files/meden.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/sufokixunak.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3704/files/67357390761.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/ronenimijesej.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3568/files/54213197044.pdf
    • https://cdn.shopify.com/s/files/1/0435/2960/1175/files/lesupesatetelom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5571/8298/files/45179293254.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/lscn_fishing_reports.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/ketepokumejurariwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/terebexozikapiritakugod.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/xupesemeralu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c9d.bin
b720587d2d74cb450109d608f29c53ebc1a130e0e9089e9e4da040069255d279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9D 5156 bytes
font_01_sfnt_off00007e2d.bin
fd757fbac6691edc36842dd52dd0ea34db28e3021f0dc80276cef211eb0eabc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2D 9876 bytes

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