Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb694fc8d9c0a73…

MALICIOUS

PDF

39.0 KB Created: 2020-08-09 05:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c013c2ac0d1b0b79b4677ea5156f065f SHA-1: 2a201e4c058805235e25209a1bd8a526e7f44e37 SHA-256: ccb694fc8d9c0a737f60767c6b23c8e679cb192611d60aa0bdc815899173eef3
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm behavior with 26 external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and link farm strongly indicates a malicious intent to redirect users to harmful sites.

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=best+pdf+reader+android+no+ads
    • http://files.valeriesavarie.com/uploads/1/3/1/1/131163635/719707.pdf
    • http://files.grandmassoapandstuff.com/uploads/1/3/0/9/130969386/5678083.pdf
    • http://files.kachinacountryusa.com/uploads/1/3/1/4/131438397/9475990.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/dolalazilafolikuxigajeva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/35517048982.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4224/files/microsoft_wifi_direct_virtual_adapter.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/59915988831.pdf
    • https://cdn.shopify.com/s/files/1/0440/9357/1224/files/53177318273.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/advanced_excel_tutorial_point_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3676/0485/files/34607004543.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/46205498662.pdf
    • https://cdn.shopify.com/s/files/1/0429/2955/3575/files/giguvabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/jquery_remove_option_from_select.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_off00005ea0.bin
e1831f4e96c7091310539bed3a0b228ab50bcd43d2837f36e816176968ab92ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA0 5052 bytes
font_01_sfnt_off00006fe2.bin
e35bea13a2e19cb5e3308adce48907b1b1f4a4d0aedacd50aa409172b1252adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE2 9300 bytes

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