Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98c1ed881e8a4f7…

MALICIOUS

PDF

48.8 KB Created: 2020-08-28 08:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5eb5327a7343e59198b8f4633afead7 SHA-1: 9bc3f2f6456b76d244566f0bca6f0e5b8545335e SHA-256: c98c1ed881e8a4f7cf8f9b1c38fd5dc0a66711edf60766b19ae3b2705f56ecf3
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'ttraff.ru'. The document body, though partially corrupted, contains text related to 'Gmat official guide 2018 quantitativ' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of multiple PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious destination. No scripts were extracted from this sample.

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.ru/pify?keyword=gmat+official+guide+2018+quantitativ
    • http://files.realmedies.com/uploads/1/3/1/6/131606011/vupanunapanosubime.pdf
    • http://files.playandlearninstruction.com/uploads/1/3/0/7/130775649/fovuganirelemaz_banag_rofenib.pdf
    • http://files.riverviewcharterschool.org/uploads/1/3/1/3/131380847/7593643e4a68.pdf
    • http://files.singsingprisonmuseum.org/uploads/1/3/2/6/132695244/tirib.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/timestamp_server_url.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3784/files/job_applying_cover_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6510/files/24544521229.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/83159994373.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/airtel_3g_dongle_installation_softwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/53968274032.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/low_back_pain_exercises_patient_handout.pdf
    • https://cdn.shopify.com/s/files/1/0438/0036/3169/files/ias_2_inventories_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/5637/9557/files/lazegubiw.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_off00007046.bin
6487bae417f9c94c3b14735d2cceaff6fb8894755d411f49be09cddd25f747ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7046 5804 bytes
font_01_sfnt_off00008400.bin
07f9c928c37dfdcbac7bd1a533d5210d092c12341cd6dd1a3c2cb44fcd544a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8400 15540 bytes

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