Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1aec47fb2f19d2…

MALICIOUS

PDF

59.8 KB Created: 2020-08-04 14:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24855799fb279850f7c7c71d4e1fd3ab SHA-1: 329af9f8b679fb6521cd921b7f72719c3e9e4298 SHA-256: 0f1aec47fb2f19d2a7387685201aeeeecc1e9c17dd2e075d78b04fe6a44aeb23
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a book title, which leads to a malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded links pointing to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the intent to lead the user to a harmful site.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=bookkeeping+and+accounting+all+in+one+for+dummies+pdf
    • http://files.mogsaddiction.com/uploads/1/3/2/6/132696111/fumikibivox-kesaxezapedusu-ponar.pdf
    • http://files.sheplayswithmud.com/uploads/1/3/0/7/130776276/xorunurew_warem.pdf
    • http://files.epiphronresearch.com/uploads/1/3/0/7/130775795/dfca1.pdf
    • http://files.cubaluxurybb.com/uploads/1/3/2/6/132681690/a4d55ee0f46.pdf
    • http://files.beltonrvpark.com/uploads/1/3/1/0/131069978/muvek_lakefajega.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8909/1989/files/nafesinaxovuro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/77949232699.pdf
    • https://cdn.shopify.com/s/files/1/0434/9670/2104/files/nubifufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7768/8743/files/70869973426.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0428/1260/4582/files/xezizowojupoxin.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/21_jump_street_full_movie_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/33134041523.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/35778527412.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/wetil.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/kepanerebukirazawokijuma.pdf
    • https://cdn.shopify.com/s/files/1/0440/0916/0862/files/11196980720.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_off0000aad2.bin
4c9ce44c3cbacd7c28b8f7482efc75543a2313adbd6ecf72c1bd7b4505b25984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD2 5588 bytes
font_01_sfnt_off0000bdcb.bin
0aecb14e6d32e46d50c887880c7478d501669819dcb7252ab7d2e51c5472ff62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCB 10440 bytes

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