Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5ff76c88ddf292…

MALICIOUS

PDF

41.7 KB Created: 2020-08-30 06:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39aea29db14d7b722fb7521561452db7 SHA-1: 8d829b0f51b714e02e69c265d89badee9728841a SHA-256: da5ff76c88ddf2924f47c6cde10830e3b8ba7312adea74bd4536dafd4478c31c
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=ancient+tablets+odyssey'. Another heuristic indicates a PDF link farm, with many links pointing to shopify.com domains, suggesting a potential SEO spam or phishing campaign.

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/wix?keyword=ancient+tablets+odyssey
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/38747987636.pdf
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/96651335388.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8766/files/zipinikurobiwoki.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/dasowu.pdf
    • https://cdn.shopify.com/s/files/1/0464/7688/6168/files/67066279185.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6a54bf9137f49c08171683fbf0417b0.pdf
    • https://static.usrfiles.com/ugd/804ff6_8a8a6f2abdd0423ab0c36870825f5d08.pdf
    • https://static.usrfiles.com/ugd/9e53d4_ccc7d575335d41b5af8e2a752d28c32c.pdf
    • https://cdn.shopify.com/s/files/1/0432/7761/5270/files/pimerore.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/6646503450.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/15191215236.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/learning_strategies_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ec.bin
d3d64f1489177d3f39bef1946e1ca722102146fb513b94627f5372f54b60f1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EC 5068 bytes
font_01_sfnt_off0000772e.bin
fbce522f4bac65cc7419c017625492e1e01fca86138f5d044cf49b40a72b36a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772E 10280 bytes

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