Malicious PDF — malware analysis report

Static analysis result for SHA-256 370a84485807b501…

MALICIOUS

PDF

42.3 KB Created: 2020-08-20 11:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afe4f0c4e3eb4ecc440418325693c1a6 SHA-1: cfb644844eb10136b3982e49f02d3d8a4e3bdc58 SHA-256: 370a84485807b50151ffe8e924c34171f4fae68b20379421b64596a5a830645e
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, disguised as a 'Tamil dictionary offline app'. This link, https://ttraff.cc/pify?keyword=tamil+dictionary+offline+app, leads to malicious infrastructure. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector is the malicious redirector link.

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.cc/pify?keyword=tamil+dictionary+offline+app
    • http://wujidu.talarium.net/uploads/1/3/2/6/132683014/7eadaf9c1cdbc.pdf
    • http://palezete.wvmountainyoga.com/uploads/1/3/1/3/131379732/d8867cf.pdf
    • http://files.marleymaedesigns.com/uploads/1/3/2/8/132814342/wilifatenasodedor.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/varufuzulusubutuza.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/sezosibunapewifiniw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5084/files/captain_america_dual_audio_300mb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/scorpion_mortal_kombat_moves.pdf
    • https://cdn.shopify.com/s/files/1/0432/8469/3160/files/82112352234.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46456123156.pdf
    • https://cdn.shopify.com/s/files/1/0437/3194/3585/files/98496858453.pdf
    • https://cdn.shopify.com/s/files/1/0439/1125/0075/files/religious_definition_of_formalism.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/27889899260.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/clinical_cases_in_anesthesia_free_download.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_off000067ab.bin
8d7c57bd18f60f71d89310b84964337c8f46e73553b7022cd7feae62dcfc6d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 5172 bytes
font_01_sfnt_off00007934.bin
8411d30f678949aa61425566e8a3d333e28cdeb59d65b3a86d5893d7d5f799aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7934 10364 bytes

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