Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b5c58ad9556130…

MALICIOUS

PDF

426.9 KB Created: 2020-07-28 16:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f21628c6adc5559c68c0a12a286c3e96 SHA-1: 879a888965424548830ccdcefeb9641acb4e8e28 SHA-256: 72b5c58ad95561300d5d636f6f94910d8ca49db0597b037202fd1f1eb25864cc
94 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, appears to contain metadata related to 'Acog guidelines for thyroid screening in pregnancy', suggesting a lure to disguise the malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9831

Heuristics 3

  • 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.
  • 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=acog+guidelines+for+thyroid+screening+in+pregnancy
    • http://files.genpartsco.com/uploads/1/3/0/7/130739949/kilinapu_fipivu_gupufosetuga.pdf
    • http://files.jrpnyc.com/uploads/1/3/1/0/131069879/5777197.pdf
    • http://files.sarahfeinertherapies.com/uploads/1/3/0/7/130775998/danavuwobo-wokitok-legaz-linediwabomade.pdf
    • http://files.my-h-anonymous.club/uploads/1/3/1/3/131378838/sefulemimivijok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/doduperedudejasevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/zeximilelelaveno.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/3292190431.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/71211022538.pdf
    • https://cdn.shopify.com/s/files/1/0432/8688/8601/files/65855022843.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0333/files/60189919687.pdf
    • https://cdn.shopify.com/s/files/1/0434/1861/5975/files/4128043288.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0448/files/87443284901.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/polizas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/folomikumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0429/0887/6956/files/biwetutuzawalefote.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vibemegabixowosepabotabux.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00063f9e.bin
3468ad7dc312f14dbccdacd6a2d440f986a59d844bc32ca3abf6d65ae6c51b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F9E 5392 bytes
font_01_sfnt_off000651f1.bin
3ab065a31b539a8e096df08e30e5e69e8617d203c3efbf48b9ca165d1eb432ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651F1 16972 bytes
font_02_sfnt_off0006862e.bin
1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6862E 16148 bytes

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