Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ee43400f51c0ad…

MALICIOUS

PDF

38.6 KB Created: 2020-08-12 00:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5dbb148d9ed37cac05f04ae26830f4ff SHA-1: 0a65837d60bd57ff72c75337679da92edba7f70e SHA-256: 41ee43400f51c0ad6acf4f028e5a62d8db5b6229cf9e91be8cb17df5434eafef
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=bs+iso+45001+pdf'. This indicates the document's primary purpose is to redirect users to malicious sites. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, likely to improve search engine ranking for malicious content. No scripts were extracted from this sample, but the presence of the malicious redirector is sufficient evidence for the attack pattern.

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=bs+iso+45001+pdf In PDF document text
    • http://files.artifactscollectables.com/uploads/1/3/1/4/131453062/3cc24e.pdfIn PDF document text
    • http://files.freshmans.org/uploads/1/3/1/8/131857626/58b06.pdfIn PDF document text
    • http://files.thestorystudiohk.com/uploads/1/3/1/1/131163635/tixefe_pejetadoxap.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/1/0433/0687/7080/files/25618010541.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/51138065453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5371/1513/files/badinerie_clarinet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/xevobaremafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/juzegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/kavoxepisusosujabikopezir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3847/4391/files/4947493260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/90954697564.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6187/0746/files/30082354235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/iqhayiya_college_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/antenna_handbook_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/julubivej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1448/7198/files/angeles_y_demonios_libro_descargar_gratis.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
🗂 Part of campaign: thestorystudiohk.com 3 samples

Related samples 5

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_off00005917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5917 5152 bytes
SHA-256: b83cbed3d1873b69d871d7a1160a5b7aa32eec93b1b8e65231ea415e59b11337
font_01_sfnt_off00006ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC6 10316 bytes
SHA-256: eab7cf5f5302cadadbcd5fff167eb7095500c4ff8eb43f21783c830bc087192b

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