Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be69136a01168cc…

MALICIOUS

PDF

39.9 KB Created: 2020-08-25 14:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9e1fd593e51c846d7fab3fe5da40209 SHA-1: 6a2420a6a0421dcec20510e9dedb297c62ee43d2 SHA-256: 4be69136a01168ccae5efe4137871c88b5e47838d345fefc6f403e0a9ccb5886
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is also present in the document body. The document also exhibits characteristics of a PDF link farm, with numerous embedded links to Shopify domains, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering through a deceptive document title and the embedded 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.com/pify?keyword=lady+gaga+shallow+sheet+music+piano
    • http://files.lumbercityhardware.com/uploads/1/3/1/3/131380558/4397329.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/57856344049.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/23777668889.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/revebaxekazadoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/fusionner_deux_sur_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/puteredudabiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/eslint_style_guide_airbnb_vs_google.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/tirisobexefisazitanasixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2362/files/62478514793.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1297/files/14626291299.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_off000055cf.bin
dc14e93b12ecc0afacaad8d154cf5a3e82d419399881802b0ec4eb0bb23d86b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55CF 5524 bytes
font_01_sfnt_off0000689e.bin
bf1cc223e37d89eae93b6d4c477958304a1b80553018bc1611206c7b2da370af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689E 13464 bytes

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