Malicious PDF — malware analysis report

Static analysis result for SHA-256 65162c120a2c6bcb…

MALICIOUS

PDF

33.5 KB Created: 2020-08-27 14:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7845a5ccbf2b4ba6c68513dd46f6aac2 SHA-1: 27203fde7a86aa81dd771177799a1f02c51503fc SHA-256: 65162c120a2c6bcb75860dd8429611b325015e7e687769e9808aa33a5ac78b1f
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.cc) that is flagged as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of a phishing lure, suggesting an attempt to redirect users to malicious sites under the guise of offering academic materials. The ML classifier also strongly indicated maliciousness.

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=introductory+mathematical+analysis+1 In PDF document text
    • http://files.paiboon.biz/uploads/1/3/1/4/131406762/1208977.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/1/0430/4125/9671/files/fexikukaxewupenabof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6108/3296/files/wogiforidafamake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/definition_of_international_migration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/avishai_margalit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5878/1590/files/ar_rahman_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/0397/4556/files/pajifapomiganudowovir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6503/0309/files/datefelezuponusemarejulot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/c_singleton_class_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/bibugedijofetaxosimizus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/my_house_free_mp3_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/pocatello_weather_forecast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/bejabeximifoluvonodalafe.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_off00004687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4687 5272 bytes
SHA-256: 7df125db1630073150415bf40781ed6a75ea19fef1ff2440b22933e838c68203
font_01_sfnt_off00005845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5845 9636 bytes
SHA-256: fbd15c110c393df4467e083262bee12117251343f7b6e9b4740e12e6a9a221d0

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