Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff65f754acfc813…

MALICIOUS

PDF

41.1 KB Created: 2020-08-12 00:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 153d1d4eb13e0f8bc3e20611b78804c6 SHA-1: 994abf06346e73d5c56d27ab609830340f133531 SHA-256: 0ff65f754acfc813935d6d341e619136a8399eeda5faa32e168b653008f79bf3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a common SEO poisoning tactic, presenting itself as educational material ('house worksheets for kindergarten pdf') to attract victims. It contains a link that redirects to a malicious URL, likely to deliver a secondary payload or phish for credentials. The ML classifier strongly indicated maliciousness, and multiple heuristics identified the redirector link and link farm behavior.

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=house+worksheets+for+kindergarten+pdf In PDF document text
    • http://files.sacredheartsisters.org/uploads/1/3/2/7/132712093/06b0a64.pdfIn PDF document text
    • http://files.liftweightsandrun.com/uploads/1/3/2/8/132815206/bozazizur.pdfIn PDF document text
    • http://files.key2evolve.com/uploads/1/3/0/8/130874318/zasabuxemer_xawapikiguromik_balasoge.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/1/0435/6590/8136/files/tajijagofadijodovudadix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/musuzezalubimunufev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/84676189021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/45569237984.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/300_accords_guitare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/76761704942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/goguviduxexikasutumi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/55973654515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/27638317894.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4021/0072/files/rokedax.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_off000061cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CC 5388 bytes
SHA-256: 39410dd5f24a58ca12596565abe5b8776924ef95b5be94dcfc180c4234743614
font_01_sfnt_off0000742f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x742F 10408 bytes
SHA-256: 85eb580dbc2b770dc9cd1ca638be7e77133020013a6b7db2075f92ea437bf4ce

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