Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13db9cbcc8dfb33…

MALICIOUS

PDF

33.3 KB Created: 2020-08-08 01:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4ccd583673034eaa687ac5d0d8558e21 SHA-1: 69c5e7096af4abc1c8f5a932d138cbd20b7a2c26 SHA-256: a13db9cbcc8dfb3376bc16ce717d74ef965066642520d9a60464b8fb63702408
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=aptitude+test+book+pdf+ethiopia'. This URL is embedded within the document body, disguised as a link to an aptitude test book PDF. The presence of a link farm heuristic further suggests an attempt to distribute malicious content. The document body itself contains obfuscated text and the target URL, reinforcing the lure.

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.com/pify?keyword=aptitude+test+book+pdf+ethiopia In PDF document text
    • http://files.julianrichings.net/uploads/1/3/1/3/131398099/3473106.pdfIn PDF document text
    • http://files.artsimaginarium.com/uploads/1/3/1/4/131406717/nozuziwel_wizit.pdfIn PDF document text
    • http://files.neuralmechanisms.org/uploads/1/3/1/4/131437822/7309885.pdfIn PDF document text
    • http://files.morpheusandiris.com/uploads/1/3/0/7/130738569/76a393.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/1/0428/8466/1407/files/40210893871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8828/8670/files/pupezozaraxila.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/46907900995.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9932/3558/files/wimiramukulafax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/19767585156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/29242940829.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/71848196548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/98335586934.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2504/6431/files/gta_vice_city_all_cheat_codes_free_download.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_off00004488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4488 5196 bytes
SHA-256: 7d20d6c22671299b32adda2dbc99fbf64a80cfb956044fef13efd19637e54efb
font_01_sfnt_off00005634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5634 10212 bytes
SHA-256: 1528825d84e486a2d0c95e29e2b720dde7123e12fea6e252eaec233a34c2fad8

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