Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac9fd8b5974365b…

MALICIOUS

PDF

53.4 KB Created: 2020-08-01 21:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2321ac4e00e0b1a1066be1ddcb8127bd SHA-1: cf893fc44d3ff72b6c44bd8fb79079af6c67f7d5 SHA-256: aac9fd8b5974365b8f88eda28873ae1b1f9eb27ef3f41d680b24323b4fd19266
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=personal+finance+12th+edition+kapoor+pdf+download'. This URL is part of a link farm designed to trick users into downloading other PDFs, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains the same malicious URL and several other Shopify-hosted PDF links, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

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=personal+finance+12th+edition+kapoor+pdf+download
    • http://files.eastmain-salonspa.com/uploads/1/3/0/7/130738765/pasudevizodop.pdf
    • http://files.jackielhutchings.com/uploads/1/3/2/7/132710627/juzezut.pdf
    • http://files.sneakyfeetfarm.com/uploads/1/3/0/8/130814308/7063105.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/26130346714.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/pekek.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2392/files/57743492719.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/nijegowozewexegaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/0913/9110/files/xuboranoretoxonozof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3925/files/83500414547.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/nidometobaxulaboti.pdf
    • https://cdn.shopify.com/s/files/1/0432/4179/9843/files/vewidifomuvunabivid.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/ketivirezudav.pdf
    • https://cdn.shopify.com/s/files/1/0429/8817/5513/files/viwage.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/lepaxapipifezipodugelon.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6265/files/revubumami.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_off000084aa.bin
5e18a380f5a3e2d0a2f23bde47714ee3d6323ddea3cef47229497094d787fd5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AA 5372 bytes
font_01_sfnt_off000096f9.bin
9ccc99efb6b49845d2fb306af4bd1b6f3f48af8f3a6ac806a655103216e8ccb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F9 10440 bytes
font_02_sfnt_off0000ba9c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9C 4324 bytes

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