Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8a07ceeec69159…

MALICIOUS

PDF

47.6 KB Created: 2020-07-14 03:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a9d6e442ed836b3941868882bc7ca11a SHA-1: 28afa7a2b2d783964466843b8a8ff2de12d40676 SHA-256: 0c8a07ceeec6915957df8676a9c55380dde10ac42557a91521e07d6758557981
194 Risk Score

Malware Insights

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

The PDF contains numerous links to redirector infrastructure, specifically identified as a malicious link farm. The document body, though heavily obfuscated, suggests a lure related to 'introduction to software engineering'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content or exploits.

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/wb?keyword=introduction%20to%20software%20engineering%20ronald%20j%20leach%20pdf In PDF document text
    • http://files.funthoughtsonlife.com/uploads/1/3/1/3/131398583/xokunog_zajodesugato.pdfIn PDF document text
    • http://files.samhoughtonchallenge.co.uk/uploads/1/3/1/6/131606073/kejelubamolo.pdfIn PDF document text
    • http://files.thecircleofspirit.com/uploads/1/3/2/6/132680915/bd655f88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vugazevilu.files.wordpress.com/2020/07/31521392636.pdfIn PDF document text
    • https://rovuxab.files.wordpress.com/2020/07/98342687277.pdfIn PDF document text
    • https://gapojojape420216599.files.wordpress.com/2020/07/mixuxuwusufulujezewosiv.pdfIn PDF document text
    • https://nigoruzi.files.wordpress.com/2020/06/deziwokepol.pdfIn PDF document text
    • https://jorogoko.files.wordpress.com/2020/07/pidulot.pdfIn PDF document text
    • https://zubijunemovo.files.wordpress.com/2020/06/goguvu.pdfIn PDF document text
    • https://xaridozav.files.wordpress.com/2020/07/jexazipegojebusofikononov.pdfIn PDF document text
    • https://juderoxer.files.wordpress.com/2020/06/93742429374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/80035645790.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/zawulebineguvuxusesiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/dulawewodixewukeriz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/xefitisanujat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6356/5718/files/naxegegedosobudonisizezak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/nonumu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/gumex.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 5

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_off00007a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8D 5404 bytes
SHA-256: 82a801c9b348f7779b387bf33992d687df9648a3a5014e1b4dcb429a01bf96aa
font_01_sfnt_off00008cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF9 10392 bytes
SHA-256: e102a898e008170f145d8d370791b161ac4f5de364efc132fc1941aa3edbbd7f

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