Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4c44b63c7c9dbf…

MALICIOUS

PDF

40.9 KB Created: 2020-08-10 11:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8a494caa04a6ffdeea8941d7aec41761 SHA-1: 5947b307dca5b295be180712fc6a559a329b34db SHA-256: ac4c44b63c7c9dbfb608d8a2ca316a4deab82d1faae2a87f4016e142cb60fca2
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=printable+brain+teasers+pdf'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic to increase visibility. The embedded document body text, though partially corrupted, contains the phrase 'Printable brain teasers pdf' and the malicious redirector URL, reinforcing the lure.

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=printable+brain+teasers+pdf In PDF document text
    • http://vuruzi.lillianandlucija.com/uploads/1/3/2/3/132303382/rizixusevi_likigusipise_jubetutosibu.pdfIn PDF document text
    • http://dorugokol.lindoncitydrill.com/uploads/1/3/1/3/131384401/wosasozanubi_mibewerixaga_vefokiz.pdfIn PDF document text
    • http://files.davismadrigals.com/uploads/1/3/0/9/130969254/529779.pdfIn PDF document text
    • http://files.acfields.com/uploads/1/3/1/4/131411199/bad8e1735b4c9.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/1/0434/8523/3304/files/rewasuzibosoganumutonejor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/free_editable_budget_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/8084780266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1144/8729/files/9051665124.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6567/0806/files/44500762479.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/62557970097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/edit_online_free_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/tubetete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/tinkers_construct_heavy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.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 3

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_off00006356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6356 5176 bytes
SHA-256: 56b15f3659e59bb1f6b05471550960965ceaf2f3d6e992a3d33bc578886865d1
font_01_sfnt_off000074f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F3 10024 bytes
SHA-256: a51d86b153210729b0e5828b9a1a2adf8c1f8052efa5eafe81f50077639eb748

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