Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcf00f5c4cd353e…

MALICIOUS

PDF

53.7 KB Created: 2020-08-19 08:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6a3b4879a7c8dbe7d52212dd963da1dd SHA-1: 096ba903d73355ec41c43f70faf0108389a7dbbb SHA-256: 6bcf00f5c4cd353ed04a1ddb1da27e49e8d75d14d8860badbfb6cb2261779c50
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) which is flagged as malicious. This suggests a link farm or SEO poisoning tactic to lure users to malicious content. The ML classifier also strongly indicated maliciousness. The embedded URLs and the PDF structure indicate an attempt to disguise malicious links as legitimate PDF downloads, likely for phishing or malware distribution.

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=aldehyde+ketone+carboxylic+acid+pdf In PDF document text
    • http://files.publishershaven.com/uploads/1/3/1/8/131871439/649349.pdfIn PDF document text
    • http://files.duannkier.com/uploads/1/3/0/7/130775971/7854723.pdfIn PDF document text
    • http://files.regalbakeryusa.com/uploads/1/3/1/4/131406412/7743718.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/1/0430/6511/4775/files/41044316949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6831/8105/files/breathing_techniques_for_stress.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/89720008048.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/tanka_poetry_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1392/9122/files/natik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/37242186050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4445/2005/files/consumer_key_twitter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6083/0108/files/battle_net_so_slow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/xowolomexugepazemamapes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/51523851631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/google_docs_find_and_replace.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/ap_grama_sachivalayam_model_papers_in_telugu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5D 5428 bytes
SHA-256: f77fb4ca352b73e94845c65d1631aa326a8e35c02681a938a537f53e19c477b0
font_01_sfnt_off000090cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90CD 10540 bytes
SHA-256: 63b1c18aaf3f7d055e6a68f023d00c6ff879ec4bbdb9a58638e6fb8f2c1df993
font_02_sfnt_off0000b4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 16080 bytes
SHA-256: 014fdb7076ebfc326e48e50914f0077be73d9a972b327c9fef30e9d59f054234

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