Malicious PDF — malware analysis report

Static analysis result for SHA-256 121d4431cb53c858…

MALICIOUS

PDF

36.6 KB Created: 2020-08-25 06:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99e719a5c6182c3196ad96b363c93f0b SHA-1: 634c524cde1d06102a474e5a0b38aa061f7810a4 SHA-256: 121d4431cb53c858db01839f337ca19993634b2b14dd80e7d484083931457b32
174 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as information about an Android Google account. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to lead the user to malicious infrastructure.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.ru/pify?keyword=android+google+account+checking+info
    • http://zupof.sd-k9.com/uploads/1/3/0/7/130775612/4229451.pdf
    • http://vavedi.asaphteachingministry.com/uploads/1/3/1/4/131482975/c8fe382e4bf5.pdf
    • http://files.christinezoppi.com/uploads/1/3/1/4/131454492/7532208.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0454/3751/7982/files/2015_chevy_sonic_ltz_turbo_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/dolew.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/26232084707.pdf
    • https://cdn.shopify.com/s/files/1/0438/2860/9186/files/79516613288.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/types_of_addressing_modes_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/funawinujawodufudafes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/54927859611.pdf
    • https://cdn.shopify.com/s/files/1/0450/7385/8710/files/charles_darwin_theory_of_evolution_summary.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/84987815003.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_off000052cc.bin
c7fdc1d230297924c0809f18425bdb9615e06808c9ee58ae987f5ee42ee0ff25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52CC 5156 bytes
font_01_sfnt_off0000644d.bin
8deb9628d9dd03fcd6d109f2304acee249fc1e7fbaae49e4de4dce4bc129c4a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644D 9848 bytes

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