Malicious PDF — malware analysis report

Static analysis result for SHA-256 19871bdbfe399ad6…

MALICIOUS

PDF

35.8 KB Created: 2020-08-06 15:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1a3fc3a5a2fdee50db22ed2a5714cd8d SHA-1: 6f67feccf6f4c9b8a8862bd61c37d49e0c2c5a41 SHA-256: 19871bdbfe399ad60025b56193564bb171cb231d4ea57948c0b2e554a4fce4d9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) that is flagged as malicious. The document body and heuristics suggest a lure for free educational material, which is a common tactic for phishing or malware distribution. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator.

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.cc/pify?keyword=cutting+edge+3rd+edition+intermediate+teacher+s+book+pdf In PDF document text
    • http://files.risingartistfestival.com/uploads/1/3/0/7/130775848/7878248.pdfIn PDF document text
    • http://files.slicklimo.com/uploads/1/3/1/3/131380870/vefinul.pdfIn PDF document text
    • http://files.myshabbychicdesignsbycarla.com/uploads/1/3/1/4/131406182/lowenesuri_nolupetilibif.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/1/0434/1350/4150/files/wiwedewavox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/63730618792.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/95280290539.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2391/6443/files/neurological_physiotherapy_a_problem_solving_approach.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1473/1429/files/2823808055.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/77553828961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1947/1781/files/detailed_lesson_plan_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7105/9608/files/86656709652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7599/9646/files/alumno_definicion_pedagogica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4441/3350/files/xujujamoxubepomuti.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 8

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_off00004a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A7C 5812 bytes
SHA-256: 63c173ed0ebb905110a23e40e57fc5e236b4ccbcf957534c2241b1eade4610bd
font_01_sfnt_off00005e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E11 10060 bytes
SHA-256: 980c8e6c5236735468c8adff48423861f2bf13b243507e64184bb17ee90141a4

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