Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d1e003bdf8c53c…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 06:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e8037655f39bb54090e7bcca3d78c3f1 SHA-1: 3ee0a9599307c075439752794cb743c7f340c3c2 SHA-256: 91d1e003bdf8c53cd5536bb1db173fa1ac38ca01ae227930b254488dc1dfb15b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link that leads to a link farm of other PDFs, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The embedded URL and the document body both point to the same malicious redirector. The ML classifier also strongly indicated maliciousness.

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.
  • 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.
  • 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=puzzle+questions+with+answers+in+english In PDF document text
    • http://files.kathleenmarchetti.com/uploads/1/3/0/7/130739275/8454044.pdfIn PDF document text
    • http://files.juliaandjustjulia.co/uploads/1/3/2/8/132814030/5182201.pdfIn PDF document text
    • http://files.jesupwscottalumni.org/uploads/1/3/2/6/132695915/xumeronopi.pdfIn PDF document text
    • http://files.cynthiastarrheartspeak.com/uploads/1/3/0/8/130814298/lunedil_bedimowapeter_didoje.pdfIn PDF document text
    • http://files.universitystemacademy.org/uploads/1/3/0/9/130969915/sedopomekexute-vosivuzadilet-niximunid-subulumiwadurek.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/1/0436/8950/9017/files/90008740567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2117/9816/files/rowatironegokuriwoteruwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/jelajolulovozug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/36968031072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6550/0060/files/the_bogleheads_guide_to_investing_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7211/1260/files/litox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/98056370841.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 7

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_off0000655e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655E 5216 bytes
SHA-256: 602f6304db088f6337adf45f954d23f4dfb7d2bed47d8b5214568be64e2a13b3
font_01_sfnt_off0000772a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x772A 10452 bytes
SHA-256: 1db8eae992d9c2d3dc7792d2e9ac607bc704b0bd805d82ffe01765ff3c205ba5

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