Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8e4cc00394cfd0…

MALICIOUS

PDF

44.6 KB Created: 2020-08-26 19:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98989f85157862f31c3bb2d8de970993 SHA-1: ce02bfa0c89170b621a71085ca9dc508846b1085 SHA-256: ad8e4cc00394cfd014bbffcb974dd27be46346d21fb41ea41fc93131b5e7b140
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to a manual. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely a user clicking the malicious link within the document, leading to a compromised site.

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=ariens+11528le+manual
    • http://files.sydniessweetlife.com/uploads/1/3/0/7/130740141/97152.pdf
    • http://files.sanchezgc.com/uploads/1/3/0/7/130775917/vevigofudilik.pdf
    • http://files.dalyspenshop.com/uploads/1/3/1/4/131409693/vowofupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/55306404702.pdf
    • https://cdn.shopify.com/s/files/1/0434/2009/0535/files/35429146875.pdf
    • https://cdn.shopify.com/s/files/1/0453/8466/3208/files/64379033721.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/62006586906.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/sample_format_of_appreciation_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/50192942275.pdf
    • https://cdn.shopify.com/s/files/1/0437/2991/1957/files/wintrobe_s_clinical_hematology_12th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5546/files/zodebevavedasaja.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/analytic_number_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53635556436.pdf
    • https://cdn.shopify.com/s/files/1/0439/8999/1582/files/11329332339.pdf
    • https://cdn.shopify.com/s/files/1/0448/0693/0583/files/77106201306.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_off0000626b.bin
174116caa37562dd62e994a35588568999deacb3d9db79c989ebc3cff5133595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626B 5320 bytes
font_01_sfnt_off0000746c.bin
05c3aaeea195183842790caca9366c13985b96becc6497e4162e97cf5ec41e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746C 15676 bytes

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