Malicious PDF — malware analysis report

Static analysis result for SHA-256 da67db6705413a6b…

MALICIOUS

PDF

47.0 KB Created: 2020-08-26 01:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de6889011e9b66536c3e3e1750d19bec SHA-1: 5e2b49a785c31259a82803a5eeec0c05f641e5a5 SHA-256: da67db6705413a6b51556d33fdd45612a359f5c618f56ac0a250b2cfcedc682d
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, potentially to distribute further malicious content or to obscure the true origin of the malicious links.

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.club/pify?keyword=star+wars+revisited+mp4
    • http://baxeda.msbender.com/uploads/1/3/1/3/131397970/2abdd23341.pdf
    • http://goxiv.stormpraise.com/uploads/1/3/2/8/132814930/zurexedopifoxikasid.pdf
    • http://files.roxstardance.com/uploads/1/3/1/0/131069819/xujaxo.pdf
    • http://files.regenerativebusinessinstitute.com/uploads/1/3/1/3/131383982/wegonizabopux.pdf
    • https://cdn.shopify.com/s/files/1/0437/1339/6901/files/character_formation_nationalism_and_patriotism.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/performance_appraisal_employee_comments_communication.pdf
    • https://cdn.shopify.com/s/files/1/0431/8262/0834/files/69392272354.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/zuganufutinimizipagut.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/xixiwazebunekaxuviza.pdf
    • https://cdn.shopify.com/s/files/1/0434/5610/2565/files/9419196800.pdf
    • https://cdn.shopify.com/s/files/1/0461/7633/8073/files/kovovewogofuxumagaxopese.pdf
    • https://cdn.shopify.com/s/files/1/0435/0715/5110/files/jobol.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/92384912376.pdf
    • https://cdn.shopify.com/s/files/1/0429/2411/4076/files/32257283106.pdf
    • https://cdn.shopify.com/s/files/1/0431/3913/7697/files/halo_reach_descargar_para_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/63343197588.pdf
    • https://cdn.shopify.com/s/files/1/0439/7321/4366/files/email_template_with_attachment_outlook_2016.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/jewowagulotu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a0a.bin
042773a199f794bdb97c31f715e636d39f70adf9d1ddc7ecdbe607ed76c74dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0A 5416 bytes
font_01_sfnt_off00008c79.bin
9984b064d89fd54f36e0963527d308195fa7abfa8b42661fc116cdcc22b6bb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C79 10192 bytes

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