Malicious PDF — malware analysis report

Static analysis result for SHA-256 21caf5ef722cb4a5…

MALICIOUS

PDF

52.5 KB Created: 2020-07-31 12:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9f5cdd687550607e82e54a9292d5e2ee SHA-1: c4ed8e0db4691f2dd76b11a591ff18e6598db860 SHA-256: 21caf5ef722cb4a515c41649209573f93d67e480f47eb407905604a69d97601b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains multiple embedded links, with one identified as a malicious redirector pointing to 'ttraff.com'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a deliberate attempt to lure users to external sites. The ML classifier also strongly suggests malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on the specific 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=oedema+adalah+pdf In PDF document text
    • http://files.artfrancois.com/uploads/1/3/1/6/131607522/282aaeadc22108c.pdfIn PDF document text
    • http://files.bhatnagar.co.nz/uploads/1/3/1/4/131406800/6907170.pdfIn PDF document text
    • http://files.patsartstudio.com/uploads/1/3/1/8/131856071/forubamig_nolobenus_sifizuv.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/1/0431/6083/0116/files/4670906974.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3568/1180/files/morokubadedutoparupur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8832/1437/files/6034336009.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/xesigujamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/motidebepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/rorenufek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/govaxilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/jazikumizukewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2157/4044/files/12119174559.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_off00009077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9077 4476 bytes
SHA-256: 9de4d5f323ae3d13e95b89cd9fedf01b32c23cad2f575e053316fa044fe0a133
font_01_sfnt_off00009faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FAF 10940 bytes
SHA-256: c2ea2b05aa6af3b5cec21e6c6cc16d86a18d8d6482b3351eae4c2b6e2fef90d3

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