Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16cea79e4f237d5…

MALICIOUS

PDF

44.0 KB Created: 2020-08-21 14:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c33a0efa7f88d842887b6d1cbb1667c1 SHA-1: 7a4e4d8f7532bc9ff601421e3be412094d405ff3 SHA-256: f16cea79e4f237d59a339d8e9ad730786d6b1f501f4aca3c60662c7cec575d70
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link to 'ttraff.ru' which is associated with malicious activity. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy 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=android+studio+setup+device
    • http://files.davisranchi.com/uploads/1/3/1/3/131380870/potipiw.pdf
    • http://files.texassurf.net/uploads/1/3/1/6/131606179/5364211.pdf
    • http://files.mybook-centriclife.com/uploads/1/3/1/4/131453645/xuvoseto-fifexumader.pdf
    • http://papajinup.femmebricoleuseofoakdale.com/uploads/1/3/1/3/131380598/vikodavoruj_zamivis_zeleta_mimezesoja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0438/2762/6134/files/1803472013.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/gutitukibexazuluvitovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/tawijujerimetituzot.pdf
    • https://cdn.shopify.com/s/files/1/0434/7530/4612/files/89680269436.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/pumobelivigin.pdf
    • https://cdn.shopify.com/s/files/1/0438/4810/6134/files/biomass_briquettes_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/77132262188.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/94938376676.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8932/files/tiff_to_converter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006282.bin
f35ff700bf86a4476296c1f4f7b19a63ebc82e033675b901cbfea4a938864f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6282 4756 bytes
font_01_sfnt_off000072bc.bin
540d6ab56528b1896c3721b41aea6d36d2d4f06d0709c73b75545d9b1a3e0228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BC 10140 bytes
font_02_sfnt_off00009558.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9558 4324 bytes

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