Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2597c9989d5324…

MALICIOUS

PDF

49.0 KB Created: 2020-08-24 02:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0616a8db0d7ce0bf2de7be8fd3535759 SHA-1: 0bf346031e67c4ab1be55eeb8b0a34877cced86f SHA-256: fd2597c9989d5324216f3639e7858cbecd4f67f6dac6a4f1621ca627f32e01e1
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=bharti+axa++insurance+copy, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to insurance and the malicious URL, suggesting a lure to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=bharti+axa++insurance+copy
    • http://denilus.collectivesociety.com/uploads/1/3/1/4/131453194/6762220.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/liwukepurenugiweda.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2952/files/arm_workout_program.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/xomafutifodazowubivakoker.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/39911835642.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/wafemaxokerimagokifud.pdf
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/81772283429.pdf
    • https://cdn.shopify.com/s/files/1/0441/1038/1208/files/adjective_order_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/bimugoxeniwitevu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/coolpad_catalyst_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/24044428036.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/95630284799.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/webomobituwisumepepaxifi.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_off00007a61.bin
34747f0f043cd347f0d4e7af02ffea72ae35da872b480af83b712cf7971899c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A61 5208 bytes
font_01_sfnt_off00008c1b.bin
88aa8a7dfb3dd1a89ec308e20b929b415c2826b67f19cf4ba4cfeadcd06a8eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1B 13588 bytes

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