Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55aea2a3b3f3a9d…

MALICIOUS

PDF

42.1 KB Created: 2020-08-02 07:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2e11ffb5477e582ccadff44d6ad24ed SHA-1: 00fa3b99093e54d02098e96beeded9b1100e909b SHA-256: b55aea2a3b3f3a9d3ab5dd0cecd6a0e12b4dc1b9edbde5186dd21954558c8e17
150 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.cc, which is likely used to host further malicious content. The document body, though heavily obfuscated, contains references to the malicious URL and other URLs hosted on Shopify, suggesting a link farm or distribution mechanism. 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.cc/pify?keyword=convert+pdf+to+text+python
    • http://files.whitepinesestate.com/uploads/1/3/0/9/130969368/8534914.pdf
    • http://files.chloescheel.com/uploads/1/3/0/8/130813042/5d7fab6f.pdf
    • http://files.pleasantmeadowfarm.org/uploads/1/3/0/7/130775537/6730473.pdf
    • http://files.sunnybankanglican.com/uploads/1/3/1/4/131453253/galipete_wudajuko_xozab_nizesunepugum.pdf
    • http://files.embracingtheimpossible.com/uploads/1/3/0/7/130738564/wokasomanovuzafutu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6508/8936/files/41091247254.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/rovol.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/ximojizekigizimudodu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/guboso.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/39188952025.pdf
    • https://cdn.shopify.com/s/files/1/0433/0517/3147/files/56170606431.pdf
    • https://cdn.shopify.com/s/files/1/0439/5817/3854/files/papabugokabuloniboxevupig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/tudunofod.pdf
    • https://cdn.shopify.com/s/files/1/0436/9983/0952/files/xevenozubarutu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0631/files/lalupezijoxifon.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/dexosasewa.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_off0000694a.bin
9e06d8531a330c41517acbd0f077af7b5e94c32b79f16826911484b879da9134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694A 4844 bytes
font_01_sfnt_off000079cd.bin
408b7f3917ffc341d1c6365c0e00073950cfb852d472f1da8fc45568f7a83fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CD 9976 bytes

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