Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf5011df7d56b70…

MALICIOUS

PDF

42.4 KB Created: 2020-08-13 14:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 566c9f9f6b1ea8bdb3b5aaae9e1a16df SHA-1: 9f41f7822f8d354cc864eff5bbd58365099f8870 SHA-256: 4bf5011df7d56b70a07720917ecece7ea0d6c0592edb02a3c6924d60f5534619
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded URLs, a technique often used in link farms for SEO manipulation or to obscure malicious destinations. One critical heuristic firing indicates a direct link to a known malicious redirector at 'ttraff.ru'. This suggests the document's primary purpose is to lure users to malicious infrastructure. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector link is a strong indicator of malicious intent.

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/wb?keyword=different%20types%20of%20sentences%20worksheet In PDF document text
    • http://files.chippewakeryx.org/uploads/1/3/1/8/131856212/163363c1b.pdfIn PDF document text
    • http://files.akmknit.com/uploads/1/3/1/3/131383771/piberajubupudukilor.pdfIn PDF document text
    • http://files.ostervillegardenclub.org/uploads/1/3/1/1/131163740/kamux.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/1/0435/8003/1137/files/tupabojivop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/bagopetunuwatexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/metal_gear_solid_gamecube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5508/6742/files/16875765089.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/poppy_avi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3492/5463/files/electronics_multiple_choice_questions_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3688/4642/files/miban.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/blutooth_headset_ps3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/3528/2856/files/one_last_breath_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/79962447691.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/0787/2921/files/mark_de_lisle_navy_seal_workout.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9244/2277/files/38781353795.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_off000066fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FA 5116 bytes
SHA-256: 56c5e978318d0439cf87348e43073c7a4615a755b05355506f12ee92a9413ae0
font_01_sfnt_off00007885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 10552 bytes
SHA-256: c66dcc3abcdc195cb46957a75f273e0e9cefdd576141c2f11469f98125fc4e92

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