Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcdae1e005b911a…

MALICIOUS

PDF

69.4 KB Created: 2020-08-19 11:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99b47cef873eebd80a13e46c051a1032 SHA-1: 7e8faabf1ee54a73fe62268a3f99faf742e6b01d SHA-256: 4bcdae1e005b911a187fb4bcd24478995ec912c5ffdda4a59ce20e670622f456
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=skf+bearing+designation+pdf'. This URL is embedded within the document body, suggesting a social engineering attempt to trick the user into clicking it. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly supports the malicious verdict.

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=skf+bearing+designation+pdf
    • http://files.catiesully.com/uploads/1/3/1/0/131070912/6eff8868e.pdf
    • http://files.tngsblog.org/uploads/1/3/0/7/130740521/pagunusesodose-ravapifom-pirojolefujig-xavagefadaz.pdf
    • http://files.francisxtobin-prresume.com/uploads/1/3/1/3/131381602/vabirudupagepazevu.pdf
    • http://files.norcalsquirrels.com/uploads/1/3/1/4/131412858/9718866.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/77173545895.pdf
    • https://cdn.shopify.com/s/files/1/0439/3123/8555/files/62520350678.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5195/files/esmo_guidelines_metastatic_colorectal_cancer_2018.pdf
    • https://cdn.shopify.com/s/files/1/0435/2186/7930/files/elevation_worship_do_it_again_chords.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/87407198686.pdf
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/33819678519.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4600/files/bosumufemifagedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9957/7756/files/40k_ork_codex_8th.pdf
    • https://cdn.shopify.com/s/files/1/0437/4013/5575/files/85847253610.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_off0000c790.bin
84268e179855fcd4b94769918931475f00fd0f8ffbdaefa6afd8e7e05393976b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 5484 bytes
font_01_sfnt_off0000da3d.bin
4973e1bc8cf56951ee5f5877839a17e6349e13de656242c925bca16eb46a5e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 14384 bytes

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