Malicious PDF — malware analysis report

Static analysis result for SHA-256 83492ba3809e4eeb…

MALICIOUS

PDF

43.8 KB Created: 2020-08-22 02:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 676c534b17ee276c48cd274c49dcc216 SHA-1: 8e62f321b1cbe5a3a9d00c317f89477ede1daef7 SHA-256: 83492ba3809e4eeb067e954f730e9fc93ed06c378c2393d35c84820320e6d7ec
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically flagging it as a malicious redirector. The primary malicious URL, 'https://ttraff.cc/pify?keyword=candidate%2527+s+overall+performance', is designed to redirect users. Another heuristic identified a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The document body itself contains garbled text and metadata indicating it was generated by wkhtmltopdf, but the embedded links are the primary indicators of malicious intent.

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=candidate%2527+s+overall+performance
    • http://saxuraj.detailedbyandrew.com/uploads/1/3/2/6/132682790/tatul.pdf
    • http://files.weststanlybaptistchurch.com/uploads/1/3/0/7/130739688/2560017.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/ase_study_guides.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/jakaxamawukawi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/73404533757.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xirapekewovefosisukepeja.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/38441226295.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/45511078954.pdf
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/maths_basic_algebra_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodol.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/carbon_dating_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1512/files/kexobunozisimegupowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/64620642123.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_off000061df.bin
76488c592820ab5b1cc8ccf39c65750a0516feb1b79bbf276230200e65e50bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 5204 bytes
font_01_sfnt_off0000738b.bin
d6e98fb6cdad4d78c466608f8635b54579b0cda1ccf45ee56dd903316d1aa7ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738B 9624 bytes
font_02_sfnt_off0000947a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x947A 4324 bytes

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