Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ac32031643d326…

MALICIOUS

PDF

39.8 KB Created: 2020-08-19 04:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01bded2d59f9826fad2eb5924cd4fe78 SHA-1: 26e96e9c615124b3481ef803a6dd1cdbadeb0f8d SHA-256: b8ac32031643d326e7951d517bc5a346dac95c5b185cdf841dcdfbfcf634e814
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates a malicious redirector link to 'https://ttraff.ru/pify?keyword=ohm%2527+s+law+worksheet', suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, also contains this URL and references 'Ohm's law worksheet', likely a lure. The ML classifier strongly supports the malicious verdict.

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=ohm%2527+s+law+worksheet
    • http://files.yrdyouth.org/uploads/1/3/1/6/131636965/5651399.pdf
    • http://files.kingphillipliving.com/uploads/1/3/1/3/131398250/doxedagunem.pdf
    • http://files.theroute92.com/uploads/1/3/0/8/130873973/zuguxizamuri.pdf
    • http://files.atlantadistrict6.com/uploads/1/3/1/4/131438641/30331.pdf
    • https://cdn.shopify.com/s/files/1/0431/9562/9725/files/tutefodefazaletatutibof.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5195/files/past_tense_of_forbid.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/tibaselafipazilon.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/79573627728.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/harry_potter_potions_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/55101992211.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/2383645237.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/talimujefudujovejotob.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/jikepivinaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/sack_of_discarded_hearthstone_s.pdf
    • https://cdn.shopify.com/s/files/1/0448/1007/6322/files/cash_book_format_in_excel_templates.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_off000054f8.bin
b48850fbf152e47d7503b1dd53d415a07041605eded8f79c8af24e83425dcd08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54F8 5140 bytes
font_01_sfnt_off00006663.bin
cbed127de96e587ad34ab1eb7363747a26f1ebfe6aa487990fe4cba53f983cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6663 13312 bytes

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