Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fef9e36264d2a46…

MALICIOUS

PDF

76.8 KB Created: 2020-08-16 22:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eec219275419f5c9f1b2d505636560d SHA-1: e748751b6fa77f1d408f5de6b445e249867f8ab0 SHA-256: 5fef9e36264d2a461e48da18de8e802efeee3b74fd55f86786164a898a05fefb
202 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm or SEO manipulation. The presence of urgency and MFA lures further supports a phishing or credential harvesting attempt. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=history+of+ashanti+kingdom+pdf
    • http://files.wbwilsontaxservice.com/uploads/1/3/1/0/131070754/tigakuvuxibava-monajamininu-mupubojibixibu.pdf
    • http://files.xdesign4u.com/uploads/1/3/1/0/131069887/miwebew.pdf
    • http://files.mark-elliott.ca/uploads/1/3/1/8/131856100/lazipiri.pdf
    • http://files.meadowbrookpololodge.com/uploads/1/3/2/7/132740805/jererepi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7206/9525/files/wrist_arthroscopy_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/cambridge_english_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0433/3617/1679/files/zoburamejuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/vuvijorab.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/zemuwexivu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8624/0162/files/edgar_allan_poe_libros_el_cuervo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/22190018632.pdf
    • https://cdn.shopify.com/s/files/1/0431/4382/3511/files/pigofof.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/libulikalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/12760869494.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_off0000e3ac.bin
30a4188188c44cc528b09e56f8f5a9cfa7a5c775ef24d594e9d529e2b9239db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 5220 bytes
font_01_sfnt_off0000f536.bin
f7c3bc85d7896b8d7cfc43a47dc3dd04db458b41fba95055a0e260b602543039		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 10136 bytes
font_02_sfnt_off000117fe.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 4324 bytes

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