Malicious PDF — malware analysis report

Static analysis result for SHA-256 840cb695b033fbe0…

MALICIOUS

PDF

37.1 KB Created: 2020-08-13 22:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 83d76c4dbdb2ba9defe0ea1d4bf01f1a SHA-1: d4e4c002e329cfa32517ba94f4b07543d9e2ecf2 SHA-256: 840cb695b033fbe0bd228ae62fdb9053e3013d90439ace9ac23ff40876007a91
202 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, specifically pointing to a redirector URL that is part of a phishing lure. The document body, though obfuscated, contains the same redirector URL and references to downloadable PDFs, suggesting an attempt to trick users into downloading malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=2+4+4+engineering+lettering+guidelines In PDF document text
    • http://zodaf.funkbusterbaits.com/uploads/1/3/1/6/131607131/lepekijuxa.pdfIn PDF document text
    • http://xefijuzow.sdoster.com/uploads/1/3/1/6/131606289/segir_jugegi_kuluwukabezoto_zodajixa.pdfIn PDF document text
    • http://files.dwidrugclasses.com/uploads/1/3/2/6/132695832/pusabotubekoxaxune.pdfIn PDF document text
    • http://files.thecoolphotographer.com/uploads/1/3/2/8/132815882/919477.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/1/0434/6196/8025/files/pedapugametu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1969/7308/files/77999284663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/how_to_use_moss.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/xusufinejafam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/36723417956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/baranenekenuzurifebugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/make_lemonade_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/anatomia_del_cordon_umbilical.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5657/9228/files/laterally_unsupported_beams.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/51089103557.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/jopuxotefikofuvogivu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/64780507566.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 4

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_off00005429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5429 4908 bytes
SHA-256: c7ed0aa27a6267d98b986e14932af79b24d948bfb5c44013fd55a49e1af28018
font_01_sfnt_off000064ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EC 10152 bytes
SHA-256: 5f1995b65ea5091980bf97d40413518ea71d43576ecf9aba73b068e6d9e305bb

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