Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb46778db8f6805…

MALICIOUS

PDF

47.0 KB Created: 2020-08-09 20:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 386e4ca787a859ca85b99f555ea41e59 SHA-1: 73ad444a91b0ff6e87061e48b98f158419ae2019 SHA-256: 3cb46778db8f68052410f520c078b20c8b7bc51ef84d6592867d4b7f9e5ac520
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely to improve SEO for malicious content. The ML classifier 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=free+marathi+books+pdf+download+sites
    • http://pogul.thenativenortheast.org/uploads/1/3/0/7/130739275/tajabod.pdf
    • http://files.intellectandcreativity.com/uploads/1/3/2/8/132814958/dca197094100.pdf
    • http://muked.mimetv.net/uploads/1/3/2/6/132683014/7df5a68.pdf
    • http://files.gramophonestl.com/uploads/1/3/1/3/131381602/nabixa.pdf
    • http://files.print2infinity.com/uploads/1/3/1/3/131379554/gilekujitep_gonubipuzas_nigokoba.pdf
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/31120433684.pdf
    • https://cdn.shopify.com/s/files/1/0433/3876/0342/files/tasovatutidun.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/bijotorujofotedurekus.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/cash_flow_statement_problems_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7407/files/36771178157.pdf
    • https://cdn.shopify.com/s/files/1/0429/5370/3580/files/28158154088.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/kelolerefexamatuvo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3212/4312/files/6898476778.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/xufilizux.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/fetik.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/katolight_generator_parts.pdf
    • https://cdn.shopify.com/s/files/1/0434/6776/7970/files/46936488336.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_off000073f6.bin
9d22dd1a765080a22f173e8cfc8a484f3c5c400e5c431e698197f5d8efa15659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F6 5532 bytes
font_01_sfnt_off000086a3.bin
00526f57be9a119129a780597ede42e4cbecf107bc5902d8454c9a678892a664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A3 12588 bytes

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