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) First seen: 2026-05-09
MD5: 99e719a5c6182c3196ad96b363c93f0b SHA-1: 634c524cde1d06102a474e5a0b38aa061f7810a4 SHA-256: 121d4431cb53c858db01839f337ca19993634b2b14dd80e7d484083931457b32
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified as a redirector for phishing or scam content. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO manipulation tactic to drive traffic to malicious sites. The document body, though partially corrupted, contains the lure text and the primary malicious URL.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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) or Microsoft license-boilerplate 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 In PDF document text
    • http://zupof.sd-k9.com/uploads/1/3/0/7/130775612/4229451.pdfIn PDF document text
    • http://vavedi.asaphteachingministry.com/uploads/1/3/1/4/131482975/c8fe382e4bf5.pdfIn PDF document text
    • http://files.christinezoppi.com/uploads/1/3/1/4/131454492/7532208.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/3751/7982/files/2015_chevy_sonic_ltz_turbo_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/dolew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/26232084707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2860/9186/files/79516613288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/types_of_addressing_modes_with_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/funawinujawodufudafes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/54927859611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/7385/8710/files/charles_darwin_theory_of_evolution_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/84987815003.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52CC 5156 bytes
SHA-256: c7fdc1d230297924c0809f18425bdb9615e06808c9ee58ae987f5ee42ee0ff25
font_01_sfnt_off0000644d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644D 9848 bytes
SHA-256: 8deb9628d9dd03fcd6d109f2304acee249fc1e7fbaae49e4de4dce4bc129c4a0

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