Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b4d1b1112de453…

MALICIOUS

PDF

46.9 KB Created: 2020-08-17 07:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 587479380adb3de988b82fa847e1c88f SHA-1: 8ffecf45704c78911f1fb351c2ed5db4f45aee39 SHA-256: 73b4d1b1112de453a7d576561be57d0623d2235255d06136f0078015de133d30
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and SEO link farming, pointing to a phishing or malware distribution scheme. The embedded URL 'https://ttraff.com/pify?keyword=html+to+pdf.+net+core+2' is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack.

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.com/pify?keyword=html+to+pdf.+net+core+2 In PDF document text
    • http://files.tyruben.com/uploads/1/3/1/4/131411542/motibinuwedafu-sokivajovedex-woletumajavelak.pdfIn PDF document text
    • http://newaxuduk.leoncharacteredu.com/uploads/1/3/1/0/131070450/9cd2f.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/1/0432/4101/3412/files/69280278722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6475/4325/files/xogepejixowunifilarem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/41148268998.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1554/4737/files/bowditch_rule_and_transit_rule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/67540957433.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9261/5073/files/80265940440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/bugup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/planning_programs_for_adults_caffarella.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/81069141194.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_off000072d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D4 5036 bytes
SHA-256: af3587e70bb6e606f588ef4fb71b2608700e3e0830955e93b552d87a5ac94bed
font_01_sfnt_off000083e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 13344 bytes
SHA-256: c3401276bb32d87efabe4af7dd6d908a2e1211602334f5a77b6652e16e4c1c89

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