Malicious PDF — malware analysis report

Static analysis result for SHA-256 38640d2a14a5c716…

MALICIOUS

PDF

40.3 KB Created: 2020-08-11 13:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0496597fbd18dbbd7857ec77972e2cc SHA-1: 2eeab46b0b2f06c2dd3b5cc57002d12e635c8a50 SHA-256: 38640d2a14a5c71616a4c0963e6f48fd846705330439ebba6c9b86235ee7dede
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=spell+check+pdf+mac'. This URL is presented within the document body, disguised as a spell-checking utility for PDF files on macOS. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=spell+check+pdf+mac
    • http://files.tabithajeanpage.com/uploads/1/3/0/7/130775309/jejabuw-jojajukodeg.pdf
    • http://files.vanvliet-kassenbouw.nl/uploads/1/3/1/4/131483097/mosozojejo_zazeletexo.pdf
    • http://zegidagup.conjunctionmedia.com/uploads/1/3/1/6/131636725/batofug.pdf
    • http://files.carriekellerequineart.com/uploads/1/3/0/8/130874278/xogus_vokamo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6182/0054/files/13749725261.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31931154882.pdf
    • https://cdn.shopify.com/s/files/1/0431/6050/2421/files/fuxinidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datofugilasififuko.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/advanced_technical_writing.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/40242562042.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0434/4132/4184/files/tewazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/an_introduction_to_criminal_psychology_russil_durrant.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1547/files/7908582698.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_off0000613d.bin
5c1d1f0b80915000c813750d176c83abf8a4583c3b67b6ec37e131260c109c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613D 5288 bytes
font_01_sfnt_off0000731c.bin
a1a5c1d5f539d1aab71e4e695946dba27d452dac31147e1a35708bd563691fc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731C 9772 bytes

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