Malicious PDF — malware analysis report

Static analysis result for SHA-256 4593005f26fc379b…

MALICIOUS

PDF

34.7 KB Created: 2020-08-22 16:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd738a212665f464a725fdb0657b8b8c SHA-1: ebf43acf7f5e272b70d45128eb3973f0dcc03622 SHA-256: 4593005f26fc379ba40375d51a9b8bf837e9edae21af63c11833d55245b6eced
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, many of which point to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This redirector is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to the redirector URL and a Shopify URL, suggesting a lure to drive traffic to malicious infrastructure. 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.ru/pify?keyword=www+celine+dion+songs+com+free
    • http://files.redriverretentionauthority.net/uploads/1/3/0/7/130739906/11fe8709.pdf
    • http://files.renattaazzam.com/uploads/1/3/0/7/130775257/7968901.pdf
    • https://cdn.shopify.com/s/files/1/0431/3150/2749/files/25916298808.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/android_auto_sync_pictures_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0429/9177/9999/files/roxesejekulu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/70374869602.pdf
    • http://jipen.selmis-llc.square.site/uploads/1/3/2/7/132740285/gorurudekavawikojawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1889/6038/files/xetobaxaxif.pdf
    • https://cdn.shopify.com/s/files/1/0428/6221/5324/files/xoxajabuma.pdf
    • https://cdn.shopify.com/s/files/1/0447/1183/7850/files/divojivoximowaxiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/go_formative_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/nra_range_safety_officer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/41308287161.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_off00004892.bin
d316a54a0b236e4b4de8246a6f1426d14770d664e3adfb862205cd329cab8e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4892 5236 bytes
font_01_sfnt_off00005a5d.bin
b68fd927b4f98bf911692856db381df731e61feb1797cc17545ca66bc49360b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5D 10864 bytes

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