Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21917f22aa99d3f…

MALICIOUS

PDF

36.1 KB Created: 2020-08-22 19:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a84ea2c95a7d8ecfa47562624d51660 SHA-1: aca2da331c3d6377a76208f8824d7e83dab71f3f SHA-256: c21917f22aa99d3f00a1336044fc7bbc875d87cf29331edef13a3514ae0ff158
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a link to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same malicious URL. This suggests the primary intent is to lure the user into clicking the malicious link, likely leading to a phishing page or malware download.

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=sda+hymnal+free
    • http://files.music2dance2radio.com/uploads/1/3/0/7/130739919/pajogigo_tajaxunasine.pdf
    • http://files.larkinpetersart.com/uploads/1/3/1/8/131856271/kigixoxodu-viwigexojaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/11th_admission_online_form_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30106301206.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/73755938566.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/mozovufapofexini.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/44998712794.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/how_to_paint_citadel_miniatures.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/wugiribosigofubodi.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_off0000445c.bin
a7791668591e03c0b1d2d20435aaf62fb9b0b8d1b8b8884524c88ee990ad887e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x445C 5176 bytes
font_01_sfnt_off000055d1.bin
168f9a6f301117c297470a33ba6b7674fdc11e3ba10217599661812b3c8586fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55D1 4532 bytes
font_02_sfnt_off00006262.bin
c13b66d5e82161e57285b42cdf9b8eea7e2fc2bc63e041391de550e8aeee0f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6262 9836 bytes

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