Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c108bb4b49e27ee…

MALICIOUS

PDF

44.7 KB Created: 2020-08-17 12:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 38b6af3289701878dd9eff4ba319feea SHA-1: cfb4c962d85d008e5c22da56cbf633b35b609217 SHA-256: 1c108bb4b49e27ee315999f4ce4c86f75e4cde62bb3cdc43979ccde2fd0790e4
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=biostar+tb85+motherboard+manual'. The document body, though heavily obfuscated, also contains this URL, indicating the primary intent is to redirect the user to malicious content. No scripts were extracted from this sample.

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=biostar+tb85+motherboard+manual In PDF document text
    • http://rupoxep.verycoolgiftbaskets.com/uploads/1/3/2/8/132814930/kakidurolaka.pdfIn PDF document text
    • http://files.cybersafetyproject.com.au/uploads/1/3/0/7/130738633/8fee6f.pdfIn PDF document text
    • http://pinari.studentfoundations.com/uploads/1/3/1/4/131437689/zuwuwopavaxirakutofo.pdfIn PDF document text
    • http://goguwexiv.integralnlp.co.uk/uploads/1/3/1/4/131407089/5f16427a8d470.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/1/0431/2186/8960/files/ielts_general_writing_task_1_structure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0858/7933/files/xigutad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7407/6315/files/how_to_make_sea_lanterns.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1771/4334/files/supposed_former_infatuation_junkie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/91564144374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/22932719261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/dikimiritodapusuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/67554655266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7759/1449/files/hdhomerun_premium_tv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/5559/1073/files/10806246588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/4097/7574/files/calculus_formulas_and_examples.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 3

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_off0000659c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x659C 5572 bytes
SHA-256: 72dd79814698efafb65b5d5fa8ff9f30294165d658db79a094e2f75202074ea7
font_01_sfnt_off0000785f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x785F 14652 bytes
SHA-256: 45b89478ca4450d16c2f32a1b0ba7d97378e3ff65d7d780cee95d7a08250ead0

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