Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cb5b31e4b4bec1…

MALICIOUS

PDF

40.5 KB Created: 2020-08-03 12:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 66c3371e431ae9ce75a136d56c6840be SHA-1: c25543125c1360cb5efda9cb03f8872e8908d1f6 SHA-256: 84cb5b31e4b4bec19c826f9a44d495d6604917e1e352bdae7a4281169869d6b7
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as a free download for a pharmacology handbook, but these links redirect to malicious infrastructure, specifically `https://ttraff.ru/pify?keyword=oxford+handbook+of+clinical+pharmacology+pdf`. This SEO link farm tactic is used to lure victims into clicking through to potentially malicious content. 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.ru/pify?keyword=oxford+handbook+of+clinical+pharmacology+pdf In PDF document text
    • http://files.adammilt.com/uploads/1/3/1/8/131871954/9287648.pdfIn PDF document text
    • http://robage.homilytools.org/uploads/1/3/0/7/130775612/fujisoluw.pdfIn PDF document text
    • http://files.andreab4me.com/uploads/1/3/2/6/132681832/tuluvefatirole.pdfIn PDF document text
    • http://files.americanimmigrationpllc.com/uploads/1/3/1/1/131164473/8355548.pdfIn PDF document text
    • http://files.lyndonleadershipconference.com/uploads/1/3/1/4/131453355/tasosupeda.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/1/0438/2539/7920/files/97038212132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3877/6223/files/ce_200_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/saloxatuwanararaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/41618515598.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/prevent_macbook_from_sleeping.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/avery_8167_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80835258875.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/28484551606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/32761445922.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12410546401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/weganobetalumoxiduxer.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 6

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_off00005ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECC 5792 bytes
SHA-256: ce75ea82e30a84608622bcf5f8af30edff53d172f02e2358538c4e5e9b29470c
font_01_sfnt_off0000725f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x725F 10056 bytes
SHA-256: 69a9da4d43dfb2ab87f7257d637f3884088c2ec0a7f68f2da4377f48ae46076b

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