Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cc0d9899f8c945…

MALICIOUS

PDF

49.5 KB Created: 2020-08-19 06:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 843774cc1bc13e739b4f294594512ade SHA-1: 3adb81ce39e046d9472e7acab63503f28cc0ef3a SHA-256: 81cc0d9899f8c945c1bb08a5b4c2c58e27d95fa26f435932fd9bfc17d37833f6
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains the same malicious redirector URL and benign-looking Shopify URLs, suggesting a link farm or SEO poisoning tactic to disguise malicious intent. 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=chesapeake+shores+episode+guide+wiki In PDF document text
    • http://files.usjgma.com/uploads/1/3/0/8/130813511/sezogepabebo.pdfIn PDF document text
    • http://files.alden43dressblue.com/uploads/1/3/2/6/132681233/f94b186815e8ec.pdfIn PDF document text
    • http://files.mathtvcourses.com/uploads/1/3/1/0/131070247/3688055.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/1/0430/4656/8098/files/63816722272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/videopad_video_editor_filehippo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/gitakoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/zabavu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5733/9813/files/nonoxofaguwepuwazopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4068/3685/files/bluebeam_revu_crack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/2102/0834/files/cost_allocation_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/wogifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/dogonupubitojujore.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 5

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_off0000842c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842C 5252 bytes
SHA-256: 40b3307844aaefb84800cd12ba331f125d188da7b2db723b11e3322e1f27cedb
font_01_sfnt_off0000960f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x960F 10352 bytes
SHA-256: c45e1a3c32ae2c844ef674ebf7d83784ce4c518ccf48edd130c012567169eaba

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