Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bf72b8f199da34…

MALICIOUS

PDF

60.3 KB Created: 2020-08-08 21:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8259bef17dc42a17e525f1973d6e1ce8 SHA-1: bf466d59372ebb94406f9450d6fbb8ba459f48d2 SHA-256: 40bf72b8f199da344ff9b60ff332204d4256fc1f52e9b83bf39ecce0ca262095
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the same URL, suggesting an attempt to trick the user into clicking it. The presence of a large number of external PDF links also indicates a link farm strategy, likely for SEO poisoning or to obscure the malicious redirector.

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=askep+asidosis+respiratorik+pdf In PDF document text
    • http://files.myacousticlife.com/uploads/1/3/2/6/132682051/zoriviwikifidedix.pdfIn PDF document text
    • http://files.bcrenergygroup.org/uploads/1/3/2/6/132682039/ded06b.pdfIn PDF document text
    • http://files.leighkotsilidisart.com/uploads/1/3/0/8/130874067/6197307.pdfIn PDF document text
    • http://files.gwenillwyd.com/uploads/1/3/1/4/131437056/wegosiwogem_kiresepef_gukugut_tunevutire.pdfIn PDF document text
    • http://files.oleanbarbershopchorus.org/uploads/1/3/1/0/131071312/4c4cdd54e56b4.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/1/0434/7042/2180/files/xepobofoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/8881/0918/files/digi_key_paypal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/98173335223.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/baltasar_ile_blimunda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/tugeliranegubagegobig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/kexukumamudegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/zuvajix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/zefolozesibogufatipop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/59748351490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7709/9939/files/49100991357.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32823332632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3951/5039/files/sipoteturijisudugeku.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_off0000a721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA721 5056 bytes
SHA-256: 91175ee1ca405149a74dfc464601d9871dded7d10fa31a9d59df609512f6a8a2
font_01_sfnt_off0000b867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 13980 bytes
SHA-256: 346a4f2c62f2cc2ffef152af3c1c40ebe67cce3f473f8c9d8f35aa9950de90ca

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