Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdc94041a2f846b…

MALICIOUS

PDF

35.4 KB Created: 2020-09-18 08:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c25e5a619b4b4d3b3be3e952b8456897 SHA-1: 6d2d8bb9eef06f583b261455b0bab84bb8c222cb SHA-256: 2fdc94041a2f846b97dd9c8de009278de68bec46f6da61574a3d47826e3ef54f
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic specifically identified a malicious redirector link. The document body, though heavily obfuscated, contains text related to 'kumon reading workbooks grade 5 pdf' and includes URLs that appear to be part of a SEO-based link farm strategy, aiming to lure users to potentially malicious content.

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.link/wix?keyword=kumon+reading+workbooks+grade+5+pdf In PDF document text
    • http://files.insideoutraining.co/uploads/1/3/1/6/131606605/4424275.pdfIn PDF document text
    • http://bagozazek.manateeconcertband.org/uploads/1/3/1/6/131636725/wisuwobikesubot_pixida_boritugeger.pdfIn PDF document text
    • http://files.cloquetpresb.com/uploads/1/3/1/4/131483097/tuwido.pdfIn PDF document text
    • http://files.chemungfire.com/uploads/1/3/1/3/131382696/vevedutepipu.pdfIn PDF document text
    • http://files.petersenacpcourses.com/uploads/1/3/0/7/130775245/aee3c25.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/1/0433/1274/2550/files/kepimivesunemisonawud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6130/4744/files/mejodaxukezaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2124/6359/files/bike_chassis_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1264/3227/files/aircraft_design_a_conceptual_approach_daniel_p._raymer.pdfIn PDF document text
    • https://5a07d8b9-cfdf-4af8-a641-458a380757d7.filesusr.com/ugd/07ef24_dea36c04ba954b63bf78b2e55bb14e71.pdf?index=trueIn PDF document text
    • https://d875afb0-7b39-4011-8847-85ccc75c10a0.filesusr.com/ugd/87ad98_725e04a6d9c24c40a3c0d558dd70f164.pdf?index=trueIn PDF document text
    • https://356edb38-2ef6-48a5-9d2f-b7e675b4b9ce.filesusr.com/ugd/23a6c3_a2a4d485ce6c4709812d4482367375f4.pdf?index=trueIn PDF document text
    • https://45c59edf-bbf5-4c75-8041-2b4adf4ea66b.filesusr.com/ugd/362633_ec225fb3913f47628bdc03cd21d27e9e.pdf?index=trueIn PDF document text
    • https://19aa10bc-303f-4414-9144-12b8a078d100.filesusr.com/ugd/26481d_cbb63cceafb94361b1ecac6c8076d04e.pdf?index=trueIn PDF document text
    • https://8a8670be-97ea-493a-abf8-e45afdf8d98f.filesusr.com/ugd/bd1fc0_453bda5e6203455db6eed1dc7842bcea.pdf?index=trueIn PDF document text
    • https://93ab048b-e6e6-4d48-873e-3527461d8d22.filesusr.com/ugd/a98ecc_ac64b81b33674241b8ef6b212034d4f1.pdf?index=trueIn 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_off00004ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA5 5720 bytes
SHA-256: 1b6aa1c236e0390e8e217d33e5a9be2421b66747cd76175f29b8882cee6142f7
font_01_sfnt_off00005f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F14 9828 bytes
SHA-256: 731b6c31b4ade8da88245314e7c5e94a824a7984871e3fead86fe0869f706e78

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