Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f042c1845f64e8…

MALICIOUS

PDF

46.9 KB Created: 2020-08-01 16:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed1346bae1a18b4e714213c28fb32afe SHA-1: e036c3e9102d22e86e4bfe4b09f423a366617ce9 SHA-256: 12f042c1845f64e89dc3ed2036597f0e02e52a16e850f1954ad9ab904b7e6fa7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute spam content. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to potentially harmful external sites through a large collection of 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.ru/pify?keyword=fara+jaca+song
    • http://files.vaniahair.com/uploads/1/3/0/8/130873826/gudajuvis.pdf
    • http://files.masksofthegoddess.com/uploads/1/3/1/4/131437670/da2cc524.pdf
    • http://files.nienkemink.com/uploads/1/3/0/9/130968920/bevuxebusosobogati.pdf
    • http://files.sugarrushcustomcreations.com/uploads/1/3/0/7/130739809/pejajepisom.pdf
    • http://files.outofthedarknessgriefsupport.com/uploads/1/3/0/7/130776100/a5567c8ee4076b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/feragofemaworasigazedapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/2273001177.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/67757701745.pdf
    • https://cdn.shopify.com/s/files/1/0428/6588/5351/files/22842609071.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/9601662297.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/8328313031.pdf
    • https://cdn.shopify.com/s/files/1/0438/1674/7170/files/american_pie_123_movies.pdf
    • https://cdn.shopify.com/s/files/1/0440/7898/9462/files/52123415598.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/fisisu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/34727945748.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/xuxafat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ea.bin
05098da43b714d9d5b9833a3ffc760bb09c28d426645f0aab48653483b280048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EA 4508 bytes
font_01_sfnt_off00007536.bin
0a6529e9e7b276ab74a017e3cea789b0e4e4413b22c78ecbbdddda9f6d70312b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7536 13232 bytes
font_02_sfnt_off00009f97.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F97 4324 bytes

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