Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd41ec55f950e6b3…

MALICIOUS

PDF

38.6 KB Created: 2020-08-01 07:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 76bab5ab3ed8e47638374eee86d72080 SHA-1: 1978e254334048e8a3d0b6f9e1255bebaff3ac0e SHA-256: bd41ec55f950e6b303500719a1fe85890ee18a27eb8a512292d9b77e4e002131
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the text 'Celf 4 manual pdf', indicating a lure to disguise the malicious intent. No scripts were extracted from this sample.

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=celf+4+manual+pdf In PDF document text
    • http://files.rizzaoriginals.com/uploads/1/3/1/4/131407571/7414810.pdfIn PDF document text
    • http://files.stjamestaos.com/uploads/1/3/1/4/131453276/9179154.pdfIn PDF document text
    • http://files.foothillsbeagleclub.com/uploads/1/3/1/1/131164383/3794914.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/1/0433/0687/7080/files/lekefokatonerosabiwifeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/73254166225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9561/1810/files/busimukokod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/fojikojul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24803542318.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/cmake_add_custom_command_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8348/9690/files/96469424034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/27789236569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/72522227005.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/26006043323.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/rixosarefegakagolelag.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5926 4908 bytes
SHA-256: 5bf559c45a4bb595ff90ed2821065fe61f2d95e36123fc6184512af776e01a3a
font_01_sfnt_off000069cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69CB 10240 bytes
SHA-256: c3045579a7cb73a64f420796a4e199a11813b5b20b9874965f681815b5ceb045

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