Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b16685f9a6e6f55…

MALICIOUS

PDF

42.4 KB Created: 2020-08-08 14:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5cb89b3448086f705d9d7f13eb24774 SHA-1: f6e77a16ed6981311ec4e5ad29fb91621da1677d SHA-256: 1b16685f9a6e6f55143831fed6d2ca69b8949c727225057996a78ed0c46b74ba
150 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to benign Shopify-hosted PDFs, but one critical link directs to a malicious redirector at 'ttraff.com'. This suggests the document is part of an SEO poisoning or link farm scheme, potentially to drive traffic to malicious sites or to improve search engine rankings for the linked content. The ML classifier strongly supports the malicious nature of this PDF.

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=servidor+web+apache+linux+pdf
    • http://files.naspain.com/uploads/1/3/1/4/131483108/fazaxusiko.pdf
    • http://zojobita.colleyvillemsband.com/uploads/1/3/1/3/131383949/2406536.pdf
    • http://files.usanaapconvention.com/uploads/1/3/1/3/131398547/5569017.pdf
    • http://files.workwithpete.net/uploads/1/3/1/4/131453555/4708978.pdf
    • https://cdn.shopify.com/s/files/1/0436/1152/1187/files/california_wildfires_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/harley_quinn_comic_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/27926765753.pdf
    • https://cdn.shopify.com/s/files/1/0430/1307/9203/files/4308872240.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3388/files/38822265921.pdf
    • https://cdn.shopify.com/s/files/1/0437/4737/7301/files/handbook_of_cathodic_corrosion_protection_third_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3695/files/88233914023.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/45091142510.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69696378660.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/93089422431.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/7534537504.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_off00006689.bin
81f8dd13a373cb2780dd79118f35fa9095ced8109d924e5a5e3692c95599c65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6689 5528 bytes
font_01_sfnt_off00007968.bin
6edf07420804f803904d8efcdfdb59ee4d62c1ef234631f176ddb22bae2a26ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7968 10512 bytes

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