Malicious PDF — malware analysis report

Static analysis result for SHA-256 8621389567c7da0a…

MALICIOUS

PDF

37.7 KB Created: 2020-08-21 01:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8f251bbecd841c76906aefb362a7c756 SHA-1: ed919ed9cb275076bf291c1f285f0d2de74462e0 SHA-256: 8621389567c7da0a006223a1e2c799dd0d43f6b976b4a6afdf80d7a24d1e339a
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 URL and other URLs that appear to be part of a link farm designed to improve search engine ranking for malicious content. This suggests a phishing or scam attempt using a link farm to distribute malware or lead users to malicious sites.

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=arrestador+de+flama+pdf In PDF document text
    • http://tenid.watkinsdancecompany.com/uploads/1/3/1/4/131453645/vigito-marulesizedodi-kumajatul.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/1/0431/7364/2406/files/3d_gun_models.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/autocad_course_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/lagukajivos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/cbic_exam_secrets_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/29171499507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/9511/3125/files/brothers_and_sisters_theme_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/jexikakipigezow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/berlin_definition_ards.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/62675622818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/babekomepiferububiferevi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/32103391760.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/can_bus_communication.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 1

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_off000052e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52E2 5176 bytes
SHA-256: 51551f48dd053cfe17871c4fd0a030d316e5fef49b9a254d0a256798a2e2f3f0
font_01_sfnt_off00006468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6468 11068 bytes
SHA-256: bd6d506de044d0d0d5f805aabeb80714a820728423de01c6f06152454debab56

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