Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea58c6a828f4aeb…

MALICIOUS

PDF

39.6 KB Created: 2020-07-31 07:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e4fafe59eb4947d063db993afcba768 SHA-1: 3b50405b4b0901566b70bcd1b69a82c4a4cfa392 SHA-256: 5ea58c6a828f4aeb26ddb58ceed22184c590f775481a4d14021c060f9ab244be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed for traffic redirection. The document body, though heavily obfuscated, appears to be a lure related to 'authentic examination papers'. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=authentic+examination+papers+from+cambridge+english+language+assessment+pdf
    • http://files.halfasshomemaker.com/uploads/1/3/1/1/131163859/wewakekopiwarev.pdf
    • http://files.designsbynoodle.com/uploads/1/3/1/0/131070011/kiwowipedopovo.pdf
    • http://files.davesexpressdelivery.com/uploads/1/3/1/6/131607467/9e47f07158.pdf
    • http://files.soap-architects.com/uploads/1/3/1/6/131606169/runimo.pdf
    • http://files.pscandi.com/uploads/1/3/1/3/131380258/bifoposekokam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/56629260977.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/rufixofinuwugejawuleluja.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/82341056843.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/60543709264.pdf
    • https://cdn.shopify.com/s/files/1/0436/4750/0448/files/23539124424.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0762/files/jojadipised.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/matufatiwavipebudevifuri.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/14673325932.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/molotudesodivefobedizum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6111/files/risuwobupomaguru.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/83945787622.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/lafujudib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b50.bin
22ac04281fffbff9e6c441e860ac694173b19d9f435aa29b4b0ff71ea946f381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B50 5648 bytes
font_01_sfnt_off00006e48.bin
a1e381154e937b62453693ee5ed37c90d5d65edcf1965c339d4501143650d992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E48 10040 bytes

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