Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ee9bf7051ea674…

MALICIOUS

PDF

66.7 KB Created: 2020-07-28 07:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4a5ee6f927c808f26508c3b58920f52 SHA-1: 682e520f3d0b91b300e1d7ed440db6b2c5c6813f SHA-256: 86ee9bf7051ea674db857f014ed54894b7812fd87b23718b5adb765a1fd29d6d
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious link points to 'ttraff.ru', a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Age of mythology chinese guide' and 'wkhtmltopdf', suggesting a lure to a potentially game-related topic to entice clicks on the embedded malicious links.

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=age+of+mythology+chinese+guide
    • http://files.katedumbleton.com/uploads/1/3/1/4/131438759/4d5fb.pdf
    • http://files.rkmirrigation.com/uploads/1/3/0/7/130738482/gudumixubuxafuxib.pdf
    • http://files.leeannphotography.com/uploads/1/3/1/8/131856129/detatinolimivif-bupomo.pdf
    • http://files.animalsmma.net/uploads/1/3/1/4/131453432/vulusagezov_tedasexupox_zasilokuzor_wuxeweves.pdf
    • http://files.blacksheepstrong.com/uploads/1/3/1/6/131606186/5786388.pdf
    • http://files.blacksheepstrong.com/uplo
    • https://cdn.shopify.com/s/files/1/0436/9347/3947/files/baluwoda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/wirizadudusizarekese.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/pepiforegolomilagana.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4658/files/30706040333.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokixud.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/69663621376.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0439/2825/6680/files/ledofalufudefu.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_off0000c491.bin
4eb6523c1c3e80ef48f0d3cd2d6c681f1b262bdb567e919272dd724346b0d4d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC491 5104 bytes
font_01_sfnt_off0000d5db.bin
53cc91a893ed2496ac8ef83fd83abf054754ab3416885c1b877ad1dc22bd3d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 12388 bytes

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