Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac0ab8bf15157f3…

MALICIOUS

PDF

35.4 KB Created: 2020-08-16 12:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96b67b4e6ce8bb5d5e5bb735c18bc8e1 SHA-1: d12fd34c9c280e0f5b02aa303a1836a1925ffe6a SHA-256: 7ac0ab8bf15157f30ec618b1963df1ccaa759b0f7a6362a263ea970607696083
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service. The primary malicious link, https://ttraff.com/pify?keyword=maths+worksheets+for+grade+10+gcse, is flagged as malicious. The document body, though heavily obfuscated, contains this URL and appears to be a lure for educational content. 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.com/pify?keyword=maths+worksheets+for+grade+10+gcse
    • http://files.maxineperella.com/uploads/1/3/1/3/131379789/6a880fdbda67b6d.pdf
    • http://muwip.houstonpolopost.com/uploads/1/3/2/6/132695471/6177103.pdf
    • http://fimufuje.investphilippinesindia.org/uploads/1/3/2/7/132741593/f7c27d85b5299.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0432/9291/7924/files/adverbs_of_time_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/kobemamotavawekon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/sales_executive_job_description_for_resume.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/12518048951.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/90192512273.pdf
    • https://cdn.shopify.com/s/files/1/0431/2599/7722/files/79793505281.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/driver_ed_final_exam_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0957/files/cheap_clear_platform_stiletto_heels.pdf
    • https://cdn.shopify.com/s/files/1/0443/5532/2012/files/xamukizikivet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/48857958281.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/29694597778.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_off00004a4f.bin
3f574d458734ba8dbff517ae5058358db3ea48989da681db0581e51de115e4e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A4F 5608 bytes
font_01_sfnt_off00005d76.bin
c4f2300bc20afe6d88fec1cc103860a132a3b56ebb26bcfb390171aa8e218745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D76 10376 bytes

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