Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcdae1e005b911a…

MALICIOUS

PDF

69.4 KB Created: 2020-08-19 11:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 99b47cef873eebd80a13e46c051a1032 SHA-1: 7e8faabf1ee54a73fe62268a3f99faf742e6b01d SHA-256: 4bcdae1e005b911a187fb4bcd24478995ec912c5ffdda4a59ce20e670622f456
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=skf+bearing+designation+pdf'. This URL is embedded within the document body, suggesting a social engineering attempt to trick the user into clicking it. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=skf+bearing+designation+pdf In PDF document text
    • http://files.catiesully.com/uploads/1/3/1/0/131070912/6eff8868e.pdfIn PDF document text
    • http://files.tngsblog.org/uploads/1/3/0/7/130740521/pagunusesodose-ravapifom-pirojolefujig-xavagefadaz.pdfIn PDF document text
    • http://files.francisxtobin-prresume.com/uploads/1/3/1/3/131381602/vabirudupagepazevu.pdfIn PDF document text
    • http://files.norcalsquirrels.com/uploads/1/3/1/4/131412858/9718866.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/1/0434/2625/0917/files/77173545895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3123/8555/files/62520350678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4485/5195/files/esmo_guidelines_metastatic_colorectal_cancer_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2186/7930/files/elevation_worship_do_it_again_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/87407198686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/33819678519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4154/4600/files/bosumufemifagedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9957/7756/files/40k_ork_codex_8th.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4013/5575/files/85847253610.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 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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 5484 bytes
SHA-256: 84268e179855fcd4b94769918931475f00fd0f8ffbdaefa6afd8e7e05393976b
font_01_sfnt_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 14384 bytes
SHA-256: 4973e1bc8cf56951ee5f5877839a17e6349e13de656242c925bca16eb46a5e9e

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