Malicious PDF — malware analysis report

Static analysis result for SHA-256 c521db5f15da791a…

MALICIOUS

PDF

37.8 KB Created: 2020-08-05 09:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f8d6d8a89d67d2f3bee0162031d1e7c8 SHA-1: 4f3e80dd69321212c61079b5f7fe1c9d192b051c SHA-256: c521db5f15da791af9aaacc353b5a246b507cc6c9e87aa204f0bd25f84ba5ea8
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, likely for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is disguised as a book download. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated.

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=the+adventures+of+tom+sawyer+by+mark+twain+pdf+download In PDF document text
    • http://files.stitchedwithcare.com/uploads/1/3/1/3/131383624/dowumi-wefudazebukop-wivavin-tajewowe.pdfIn PDF document text
    • http://files.ignitecities.com/uploads/1/3/0/7/130775195/kerojuvo-fitagojesez-jasog.pdfIn PDF document text
    • http://files.janelletherien.com/uploads/1/3/2/7/132741176/rebozokesij_makemoripapu.pdfIn PDF document text
    • http://files.bagsofelegance.com/uploads/1/3/1/3/131398504/kenixer.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/1/0430/2451/5229/files/kuvosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4222/6854/files/xodajosifefesapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0294/3909/files/vubapiguzamivevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/bupojademuxifowij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1371/6643/files/dulimugigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65107231385.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7573/1607/files/39528344257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1619/1138/files/94088623609.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/kadanafanirirekerikipol.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_off000053c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53C1 5688 bytes
SHA-256: f41fb13b5eaba85ccd070e7175000b2ba97d19fd280b9242c230004b60b019e7
font_01_sfnt_off00006705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6705 10348 bytes
SHA-256: 8b686155733adf6cd31fd2fcbc376bcdb61c134f03529c79d3fb734de07a0143

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