Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bf241c921d31f7…

MALICIOUS

PDF

70.2 KB Created: 2020-08-16 00:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc1c9228fb6e5f2730fec35f64c86877 SHA-1: 908f58453e08a7cac2d6d2b6e04802e3fe827b09 SHA-256: b8bf241c921d31f79bced358ec4ce5ea29ebc83b31934b904fe91d189f2b37c5
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link and a link farm, indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains text related to 'banana plant information in marathi' and a URL that appears to be a redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely a user being tricked into clicking the embedded malicious link.

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=banana+plant+information+in+marathi
    • http://kovuki.lucky13salon.com/uploads/1/3/2/3/132303035/d9a28ed17.pdf
    • http://files.aedsa.ca/uploads/1/3/1/3/131380052/d8720ede15ea.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0872/files/gokupepudosuwigimun.pdf
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/physics_textbook_year_11.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7875/files/mukoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/75588269814.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6006/files/57434471861.pdf
    • https://cdn.shopify.com/s/files/1/0437/1709/9675/files/gunujewupoguxenilavap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6767/8618/files/98881482373.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/actionscript_3_game_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/6304/0408/files/estimulacion_del_nervio_vago.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0441/0458/1272/files/atto_di_dolore_testo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/what_is_a_pointer_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/sistemas_economicos_capitalismo_y_socialismo.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_off0000d63f.bin
f69cfb3add24c5b8f85141823f70789471d5d520ff2767295f3c320fdd487ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 5012 bytes
font_01_sfnt_off0000e71b.bin
e196876136cd1167718f099ca82ce32b3e4af719aaa75715219ad63f3fb655ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 10732 bytes

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