Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa33f1f273cc9c0…

MALICIOUS

PDF

58.0 KB Created: 2020-08-04 11:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1724189d33ac366115bff84877732e SHA-1: 9b7c2fcfd39f48027c9975ab51e1a13af7802a76 SHA-256: 9aa33f1f273cc9c0bb9cc96e2a59d288fa93aeefb736deb2fea333ad6e47a0c8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the heuristic firing. The presence of a link farm suggests an attempt to distribute malicious content or SEO manipulation. The ML classifier strongly supports the malicious nature of this PDF.

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=writing+a+description+of+a+person+pdf
    • http://files.mrslack.com/uploads/1/3/1/4/131455722/2524835.pdf
    • http://files.juliemartincounseling.com/uploads/1/3/1/8/131856492/buxikofubupodan_fawesidupepu_jewoxone.pdf
    • http://files.irishclubmississauga.ca/uploads/1/3/0/9/130969937/kenitel.pdf
    • http://files.acjewelrycreations.com/uploads/1/3/1/0/131070911/menelazeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/jupexaxososewub.pdf
    • https://cdn.shopify.com/s/files/1/0437/7015/1061/files/lurimomok.pdf
    • https://cdn.shopify.com/s/files/1/0438/3480/2333/files/99171723135.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/sodevifiwujuro.pdf
    • https://cdn.shopify.com/s/files/1/0430/9146/0247/files/regawubozugukuwomugome.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9310/files/17138694949.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/36966909262.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/when_does_minecraft_1._14_come_out.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/52533121348.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/25220895964.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/26754203303.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/52332310859.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000710d.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710D 6440 bytes
font_01_sfnt_off00008101.bin
f8c60e71cf502ae6b5f897983d34b157226e9cea4d0ef94e677bf87504f61d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8101 5304 bytes
font_02_sfnt_off00009328.bin
6e90814a4c74171e1e34ccaefde28bcb9b348ff200f4007328258266ef6adf29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9328 3676 bytes
font_03_sfnt_off0000a11d.bin
e2687575e60ef1687d68968d8bdc70f204ccb7bbedeb880ce8386cb997cc9e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA11D 9900 bytes
font_04_sfnt_off0000c32e.bin
090087e0378b6391d3c66dd17c0bad7366d6604d0ddf135a12d2b86f83edf51b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC32E 16580 bytes

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