Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12659c10111b645…

MALICIOUS

PDF

40.7 KB Created: 2020-08-15 04:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a91103be2153f8f749704bfef499dacc SHA-1: 5be3f5d9e4805ad18f4d8e6f5f97668ca1285507 SHA-256: e12659c10111b645e68f09700f895bece1f5019db670fe2bddbca05b023d77f0
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is `https://ttraff.com/pify?keyword=android+ui+automation+testing`. The presence of a large link farm, with many links pointing to Shopify domains that are confirmed benign, suggests an attempt to disguise the malicious links among legitimate ones. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive use of redirectors points to a delivery mechanism designed to obscure the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=android+ui+automation+testing
    • http://files.debsdetours.com/uploads/1/3/2/3/132303138/bixetunarijuro.pdf
    • http://files.ndesounds.com/uploads/1/3/0/7/130738769/9248813.pdf
    • https://cdn.shopify.com/s/files/1/0430/9667/0365/files/catan_card_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/88512013800.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/lazomudatazenajuvebumuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6966/files/rubepuliwudafone.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/xafowogik.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9944/files/32972321487.pdf
    • https://cdn.shopify.com/s/files/1/0450/3502/8630/files/public_policy_analysis_noun.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/nidiba.pdf
    • https://cdn.shopify.com/s/files/1/0435/3058/4213/files/factoring_common_monomial_factor_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/abstinencia_alcoholica_tratamiento.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_off0000632f.bin
26a93171bc550b421fc6db5414ce04b06d3b1c1dd073a49e51c69bcec672544f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632F 5104 bytes
font_01_sfnt_off00007467.bin
b5d92834193d9dbc657b2d500e383056c5de49410c02a681f287e0e217a419d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7467 9916 bytes

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