Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab3a74843897c54…

MALICIOUS

PDF

35.2 KB Created: 2020-08-22 22:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0f6f5ff8402e20048e32866b71bdfbaf SHA-1: 2981f9c40d75bfb75223b484b478bf5948601415 SHA-256: fab3a74843897c5472c3e257882dffff2206ea693caf916ba32d8e1b971241e7
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a 'balancing chemical equations worksheet'. This indicates a social engineering attempt to trick the user into clicking the link. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent. No scripts were extracted, but the primary attack vector appears to be the malicious URL embedded within the document.

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=balancing+chemical+equations+worksheet+tes In PDF document text
    • http://wukuxe.dashingkennel.com/uploads/1/3/2/6/132682883/2478161.pdfIn PDF document text
    • http://files.yogawithminta.com/uploads/1/3/2/7/132710748/2190998.pdfIn PDF document text
    • http://files.wellingtonartgallery.com/uploads/1/3/0/9/130969572/6511158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/aims_and_objectives_of_education_in_pakistan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8364/5599/files/29402888948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/mijobotatevigemejoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1674/8188/files/82113416922.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/93082795850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/42122275597.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1217/7563/files/adobe_reader_software_free_download_for_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9101/6347/files/basel_3_norms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2512/0927/files/cells_of_immune_system_student_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000040fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40FE 5428 bytes
SHA-256: 9098f8e9394693454bd3d98bf182df57f8ba17cfe55aef41034b5cee496ee115
font_01_sfnt_off0000534b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x534B 8952 bytes
SHA-256: 4effd99dff594005f44c60e2333d01f92d24b5241cb5ee69b22cb92cc99751a3
font_02_sfnt_off000071c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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