Malicious PDF — malware analysis report

Static analysis result for SHA-256 816caba3677a7adf…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 06:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6b53b5ca3dfbddc55f73ab655e59d024 SHA-1: 7acfcb1d853f3e99aabfb8d67fc5664b22573574 SHA-256: 816caba3677a7adf0fd6193a5be0f4e6400bed8c9ba50a3430cae7a1c5348191
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector service at 'ttraff.ru'. The heuristic firings indicate that this is likely part of an SEO link farm or a phishing lure, aiming to direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=alveolitis+alergica+extrinseca+pdf+2020 In PDF document text
    • http://files.l2progamers.com/uploads/1/3/2/6/132695636/98376608.pdfIn PDF document text
    • http://files.ywamchicoshop.com/uploads/1/3/1/0/131069869/tevonajoxalo_gugejomarawafu_kazanezazeruju_jobapotigak.pdfIn PDF document text
    • http://vaxus.nfordtransitsystem.com/uploads/1/3/1/8/131871390/c370104e79fd.pdfIn PDF document text
    • http://files.cfomtg.com/uploads/1/3/0/7/130776015/160b75.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/1/0440/1538/6789/files/conceit_in_metaphysical_poetry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/49891577380.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8039/9513/files/nonanorexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/15760275726.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6980/6494/files/biophilic_interior_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5064/6169/files/good_charlotte_good_morning_revival.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/83504771482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/bekuxekagasogimafadur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9187/0375/files/fundamentos_psicologicos_del_curriculo.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_off000069cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69CD 5712 bytes
SHA-256: 81aad32ba2f54333adcd319837bd2ccd3f11ee31a8e413be5c30cafcd9d25477
font_01_sfnt_off00007d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5B 10312 bytes
SHA-256: 7f703704bf55e336a6733aa2fe34b54bbf30df214a00cc4bb03b34080ae8871e

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