Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fee630d848b48d…

MALICIOUS

PDF

43.4 KB Created: 2020-08-11 03:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b161ceab6d0bb4b7ae72f4b23a098a1d SHA-1: 047052d7669762bb5fa1a7fb01cfdea6d4b475f5 SHA-256: 92fee630d848b48d37dacffc21674225f800587c4cafb28d8fbe821e7736a9bd
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=the+cask+of+amontillado.+pdf'. This indicates the document's primary purpose is to lure users to a malicious site. The presence of a large number of external PDF links, while many resolve to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to obscure the malicious redirect. No scripts were extracted, and the document body is heavily obfuscated, but the malicious redirector is a clear indicator of malicious intent.

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.cc/pify?keyword=the+cask+of+amontillado.+pdf
    • http://remosoz.littlebitfishy.com/uploads/1/3/0/7/130739561/nokuwodarinab.pdf
    • http://files.catherinebliss.com/uploads/1/3/0/9/130969160/rekaloniw_tizapevurok.pdf
    • http://roxufu.thecozycottagemaine.com/uploads/1/3/1/4/131406390/6945210.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/1402297233.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/87820667058.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/ruvalezowezulamoru.pdf
    • https://cdn.shopify.com/s/files/1/0435/7803/2296/files/learning_english_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/2729/9478/files/pufotepedetumuvafaseleta.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/winchester_model_50_disassembly.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/cours_d_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/que_es_el_desarrollo_psicosocial.pdf
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/85505402344.pdf
    • https://cdn.shopify.com/s/files/1/0434/8339/8310/files/sixumupemikesa.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_off00006c99.bin
0c384b3dc6d3ef5724c5e9cd25e3c0c42b4ad666f1cdf1fdfbed97fee923b022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C99 5344 bytes
font_01_sfnt_off00007ea5.bin
56d7da6e0579210fcff612fbc87e82657a2b899f9351ce2e0a61f1ce9130e0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA5 9968 bytes

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