Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5d9665cd7b6cff…

MALICIOUS

PDF

51.2 KB Created: 2020-08-05 04:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 020f90c693dac07d6b3990e72cf49742 SHA-1: 3f821d38be17449c5de6704a2db152173b825222 SHA-256: fb5d9665cd7b6cff39c9486dcc4791dd7128cd2ae62377af4c22f42051913812
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=brain+stem+death+criteria+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic. The ML classifier strongly supports the malicious nature of this PDF.

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=brain+stem+death+criteria+pdf In PDF document text
    • http://zorugal.yaaitsanartstudio.com/uploads/1/3/1/3/131398008/xuzan.pdfIn PDF document text
    • http://files.balanceyourwellnesstoday.com/uploads/1/3/1/6/131606815/1927226.pdfIn PDF document text
    • http://files.cmspso.com/uploads/1/3/2/6/132695329/3130898.pdfIn PDF document text
    • http://files.fit2day.ch/uploads/1/3/0/7/130739459/1209206.pdfIn PDF document text
    • http://files.gicentralcatholic.org/uploads/1/3/1/6/131637043/954c44.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/1/0430/5335/1066/files/34051330896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/percussion_ensemble.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/56972856008.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5007/3240/files/android_version_9_easter_egg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8048/2967/files/navilirorerepuxem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/vevuwed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/71716973283.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/35900587254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/nixozusuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/48602065572.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9910/9016/files/finnegan_neonatal_abstinence_scoring_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/lekuxufu.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 6

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_off00008a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A95 5412 bytes
SHA-256: 50f629bd9392339a6be91294d12acf74cc889d9c4f8cdd9c2b4401f0576cf0ee
font_01_sfnt_off00009cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD3 10160 bytes
SHA-256: 39b24dea22d2fcec69ed6233106bb42525134041192bc329c297b3ec94c477f6

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