Malicious PDF — malware analysis report

Static analysis result for SHA-256 431f9cf4843b18c0…

MALICIOUS

PDF

59.3 KB Created: 2020-08-13 22:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae7f65d31e854d1ea99a009e37094f91 SHA-1: eb3c8d071b190c8e91489268d21f8b53f115ebc7 SHA-256: 431f9cf4843b18c0e27175166772ac5b0760ef3393e3c610c0e02e4aa006e36a
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru', which is likely used to obscure the final destination. The document body also contains the same URL, reinforcing its malicious intent. The ML classifier also flagged this PDF with high confidence.

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=is+it+love+matt+answers+chapter+2
    • http://lililu.lovefibres.com/uploads/1/3/0/7/130775181/miniselomu_subuxasoj_puxuvuvizagik.pdf
    • http://nolupegax.talesfromasketchyartist.com/uploads/1/3/0/8/130814017/wufiso.pdf
    • http://files.darkestsidesilver.com/uploads/1/3/1/4/131438111/lidodimogite-lawuburewok-sudoxar-pavomolimib.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/tuvemokoboxapokaje.pdf
    • https://cdn.shopify.com/s/files/1/0447/5689/3847/files/adverse_action_letter.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/58458736745.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/dexiwimi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/vuragegenovujaligik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/lekakubuzagifajepilokunin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0929/files/tibigawugovos.pdf
    • https://cdn.shopify.com/s/files/1/0433/9911/9013/files/xixesadavixoxapaner.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/fukebe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/graphical_presentation_of_statistical_data.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/jafufa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/burda_magazine_download_free_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7570/files/98219828181.pdf
    • https://cdn.shopify.com/s/files/1/0431/3225/6407/files/rrf-_1_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0431/5227/7670/files/43394629733.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_off0000ab08.bin
730981c8b86612c2c22fe2492588f36759f8fe5e575595d4d0f12470a2dc0581
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB08 5392 bytes
font_01_sfnt_off0000bd48.bin
8bf27174ebd48f1c30d762d5323b71e43f2e997d46f9f04b6177c84d16ff1a97
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD48 9964 bytes