Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef98a6389365eae7…

MALICIOUS

PDF

46.7 KB Created: 2020-08-18 23:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc63503caa6ca85af2da4832a1b334d3 SHA-1: 8c2f12f82b3bf3a289f3ddf5e88a6b8646c0405e SHA-256: ef98a6389365eae709785cc92a8966669e7fe7cffe3dcb8903a950e2eaf917ce
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. The document body itself is heavily obfuscated but contains the malicious URL.

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=formal+definition+of+karyotype
    • http://files.sumikoshimada.com/uploads/1/3/2/6/132695575/b4243333be412.pdf
    • http://files.gracewelcomecenter.org/uploads/1/3/1/6/131637325/8679198.pdf
    • http://javikiv.timmetz.com/uploads/1/3/1/1/131163744/ginurujoduna.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5637/files/perkerasan_lentur_metode_aashto_1993.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3533/files/dejeniwazojukunotak.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/11418393564.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/71095814070.pdf
    • https://cdn.shopify.com/s/files/1/0437/7110/1346/files/htp_invertig_221.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/agentes_economicos_de_circuito_economico.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/25415312556.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/46815609129.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/best_cheap_manual_transmission_cars.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/85249765589.pdf
    • https://cdn.shopify.com/s/files/1/0432/2420/3424/files/tomozolexakifed.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_off00007a02.bin
d8208642c8793d9fbd41ddf4a290dfca269122f327da4d9c2b2a392bc1c9fa48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A02 5128 bytes
font_01_sfnt_off00008b6c.bin
ce14da3e5f0a2128abe3dd4f03360749857ceba53539e87e4a3d5b4d7b77ac7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6C 10144 bytes

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