Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dc09d8d100da2e…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 13:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c4712e2bb6fcc059e1897153bc34291 SHA-1: bce2de22c611377ca53eec0dba0e3766cc27e9c6 SHA-256: c5dc09d8d100da2ea4379b820c40611e469e53b69839ad690f07702c3c00feaa
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL found in the heuristics. The presence of numerous external PDF links also suggests a link farm or SEO poisoning attempt, further supporting the malicious intent.

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/wix?keyword=heart+of+gold+harp+tabs
    • https://static.usrfiles.com/ugd/79e0dc_92c944fd5d5648189a74856c2bb3fca5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b98bb2402670435e9064fa46bdc5ad28.pdf
    • https://static.usrfiles.com/ugd/40512e_fbd076dc347b4b8da9348f1d53fb53ea.pdf
    • https://static.usrfiles.com/ugd/60933b_2c56e14587f14d9b9b5bd15ae5bdfa76.pdf
    • https://static.usrfiles.com/ugd/20d83a_752bc81113eb435e96dc7e064eed2ef2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d27470ce9b60460db4db6588a0ddc319.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eec4bbe028b4a24be489570cf5eb964.pdf
    • https://static.usrfiles.com/ugd/b8c837_76c30cc56cbc4a86933abdb895df313a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5abc7c3734184c5c966a4248b73eebd2.pdf
    • https://cdn.shopify.com/s/files/1/0435/2036/0600/files/83994367025.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/16023799312.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/the_story_of_an_hour_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/zodakedoviwukadolelorapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/85492766478.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/inquisition_companion_approval_guide.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_off000065c0.bin
04608bb190c0f5ad6758a0f668ae28bd4067f9a794417e4b192551f826ade79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C0 5404 bytes
font_01_sfnt_off00007811.bin
bcaf5b5bd4a759d15ba4b82e5c495b9a935efbfe378963a1971912f555cc49f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7811 10400 bytes

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