Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bfa3226701da3a…

MALICIOUS

PDF

43.1 KB Created: 2020-08-14 15:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7ad6ce80928f603251bee4cd49ed7ae8 SHA-1: a64a568f5c3d731deb429f8c9477e832d750ee68 SHA-256: c3bfa3226701da3a8861028750a3ce34065b37582524b0ca2c8f635b68fbe23f
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL designed to trick users into downloading potentially malicious content. The document body and heuristics indicate a lure related to an 'answer key', directing users to a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to deliver a second-stage payload.

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=answer+key+2019+clerk In PDF document text
    • http://files.mumma-baby-space-online.com/uploads/1/3/1/6/131606261/e36a405730c4d6.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/1/0431/5706/1781/files/33896840971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/up_board_maths_book_for_class_12.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/addison_wesley_math_makes_sense_6_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8801/8594/files/natoselolani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7490/2430/files/mormon_doctrine_and_covenants.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/fusobibetinomesepoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/fanaduji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/20862666865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6801/2182/files/cambridge_english_empower_a2_descargar.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 2

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_off00005e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6A 4864 bytes
SHA-256: a830d920a4253fea3f62e6b100b3b9598bf726be97a8f7311076c00df95e03d5
font_01_sfnt_off00006f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F07 10360 bytes
SHA-256: 599191b99cdfa0d59406ba95c49d44743a7fda82fbf31fb7b8d673dfe89f7928
font_02_sfnt_off00009234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9234 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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