Malicious PDF — malware analysis report

Static analysis result for SHA-256 98db4dd0a905c45a…

MALICIOUS

PDF

47.4 KB Created: 2020-08-03 21:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e90962961745d295e167de7642cbfa5c SHA-1: d4dfe28c669efb4cfd4e4f8a127b8e3ca11f2fab SHA-256: 98db4dd0a905c45afb2c6cadee3797f74925b5855e8e702fa27aebbcc596ba70
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=calculus+olympiad+problems+pdf'. This URL is likely used to lure victims into downloading further malicious content. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or redirection strategy. 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=calculus+olympiad+problems+pdf
    • http://files.michellesamuelsolicitor.co.uk/uploads/1/3/1/4/131406222/kerewazikukemo_lifori.pdf
    • http://files.vivalaglamnails.com/uploads/1/3/1/4/131453294/4279598.pdf
    • http://wifutevod.takahirokudo.com/uploads/1/3/1/3/131381518/9646e8d2b.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/tarigimevaxojalikowo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8770/files/58817674222.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/dozetanogavokafadejuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/bopipida.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/1570263904.pdf
    • https://cdn.shopify.com/s/files/1/0429/6612/2662/files/tivefigenefukorijubelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/hesi_a2_secrets_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53975554289.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/jebituwuwujaronadixozet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0853/9299/files/14146434223.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/fury_warrior_pre_raid_bis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/50225104467.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ae.bin
e365c7065ff002a65f52e042cc87074db82e3b47d83fc08d8d11367ec6a9d153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AE 5448 bytes
font_01_sfnt_off00007717.bin
32d5768cae1b9984443252e7f1f97b4da775d586ad7f4790fffb7a4812c21e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7717 10576 bytes
font_02_sfnt_off00009b88.bin
f7f944af48a1f29a4fc81369acbb7667dc0c0bb312d09d0e658341ed730dbf86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B88 16144 bytes

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