Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6415e86f754a69c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-23 04:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0e810f87f11a584d485af98a5d6965b SHA-1: 3404243de5c1fac0f6d241ae9053b9ed55d02932 SHA-256: f6415e86f754a69c2317368df9b07afc39dd6006f8b8fd64f99288dfebea203d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=informal+gathering+l%25C3%25A0+g%25C3%25AC'. Another critical heuristic identified a PDF link farm, indicating a potential SEO poisoning or spamming campaign. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of malicious redirector links is sufficient to classify this as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=informal+gathering+l%25C3%25A0+g%25C3%25AC
    • http://files.michellewiebe.com/uploads/1/3/0/7/130739951/2837212.pdf
    • https://cdn.shopify.com/s/files/1/0432/3734/3387/files/ragomogagowam.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7173/files/minecraft_pickaxe_names.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/38898783819.pdf
    • https://cdn.shopify.com/s/files/1/0428/3455/9143/files/la_evaluacion_en_el_aprendizaje_cooperativo_johnson.pdf
    • https://cdn.shopify.com/s/files/1/0436/0860/4829/files/75623045822.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93434530871.pdf
    • https://cdn.shopify.com/s/files/1/0432/3141/2379/files/zarajej.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_off000063e1.bin
a3f4643bf386fd8b819babb92e6ba3a420dd533c33d247370e836344f7f14d51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E1 5228 bytes
font_01_sfnt_off000074e7.bin
2c1c9687c8f9b3eadc32c4b036d1207b0ede621a7620f49dcf13f2cb1e13e232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E7 11024 bytes

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