Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b0c3660490fac5…

MALICIOUS

PDF

36.4 KB Created: 2020-09-16 08:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4770b819cffec0de895fb5899675a39 SHA-1: 58c687127b39593ae1ddee32797ab7a1df7f33be SHA-256: 71b0c3660490fac5f8f874c16ab9a9ca05e94bd386667e7693608a6e0b783799
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though garbled, includes a reference to a "2017 yamaha viking owners manual" and a URL that aligns with the malicious redirector. The PDF_SEO_LINK_FARM heuristic further suggests a pattern of creating numerous links to external resources, likely for SEO manipulation or 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.me/pify?keyword=2017+yamaha+viking+owners+manual
    • http://zopenulan.coorsdentists.org/uploads/1/3/0/7/130776299/4184761.pdf
    • http://butejapuw.matthewfleckenstein.com/uploads/1/3/2/6/132682137/dedarumora.pdf
    • http://wuwutun.katarinaclairecorner.com/uploads/1/3/1/6/131637136/tafujerijitasenazafe.pdf
    • http://files.rebeccasnutfree.com/uploads/1/3/2/3/132302970/7036050.pdf
    • http://files.laurendobee.com/uploads/1/3/1/3/131380717/zolapa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1044/0859/files/15755150675.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/14012770132.pdf
    • https://cdn.shopify.com/s/files/1/0439/8183/2350/files/dufepusatixovezujosafetod.pdf
    • https://cdn.shopify.com/s/files/1/0431/3225/6407/files/55843884027.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/birads_2020_portugues.pdf
    • https://static.usrfiles.com/ugd/f96b02_39d9eca410404fe6ab11c7d1ffebb20b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ad48b43fafa4531af53524faa141fbf.pdf
    • https://static.usrfiles.com/ugd/5360f8_8d6614a68c7e4a01b8ebac661b3dc0ca.pdf
    • https://static.usrfiles.com/ugd/04c368_740650709ae041cfb30bd1f79d2be066.pdf
    • https://static.usrfiles.com/ugd/035627_6db10715278e4be9b6c9f2e88c16f385.pdf
    • https://static.usrfiles.com/ugd/f65175_9f6e9d7429234e0fad6c4844bf034dce.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_off00004eae.bin
32e4cbe46e2f11466fe7ff459824c10383fc8c8e25e0eaec50e6054db6cebba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EAE 5728 bytes
font_01_sfnt_off00006223.bin
299cf6fec597a99cea2bfbd5665c35a052e37cf709011ecaf6a8610bb61fdfa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6223 10136 bytes

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