Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf0e1be7ec343fa…

MALICIOUS

PDF

89.7 KB Created: 2020-08-10 00:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa112702705bbd437d3927222f740df7 SHA-1: 7211ec2f99b6953f55422beb3279b7fe2bc2d13c SHA-256: acf0e1be7ec343facd5e83e3d6c28366a06f71eca0698c7ae20c6a85849f23c5
152 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.ru/pify?keyword=aparajita+stotram+book+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to disguise malicious content as a book PDF. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=aparajita+stotram+book+pdf
    • http://pufetimup.kossecc.org/uploads/1/3/0/8/130874493/ruforitopogawu-zufedujozix-dilad-pifaverik.pdf
    • http://files.swpahro.com/uploads/1/3/1/4/131407855/3981345.pdf
    • http://files.naturehouseaz.com/uploads/1/3/1/3/131380756/400e85fd6035.pdf
    • http://files.makersguildinwales.org.uk/uploads/1/3/0/9/130969825/vaxoxulolewa.pdf
    • http://files.kodiaklions.org/uploads/1/3/0/8/130874478/nomitetonaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7900/files/zesexawaranirejixu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3177/9745/files/acid_bases_and_salts_class_9_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2610/files/webobarajisu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/80922674629.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/cdf_from_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/surf_report_santa_monica.pdf
    • https://cdn.shopify.com/s/files/1/0429/6998/9279/files/tewopikafotuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/rapixagodedasewetil.pdf
    • https://cdn.shopify.com/s/files/1/0429/5881/5398/files/sql_server_2020_development_tutorial.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/
    • https://cdn.shopify.com/s/files/1/0434/3260

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85f.bin
c4e798dfa3d4306199e2c37ae2ed54bea4b23a895fc3fcf725a34f1a60dc12de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 5424 bytes
font_01_sfnt_off00010abf.bin
d1236866b16771d16fe4986b720c0776477e6e446b984517613a33f0a377a1bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 15092 bytes
font_02_sfnt_off000139c9.bin
58bb612da2c2d033785d96ba4a99db1cfab92190c6b11f5dc25bc4abc1deffab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C9 9664 bytes

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