Malicious PDF — malware analysis report

Static analysis result for SHA-256 12160a34afa6195a…

MALICIOUS

PDF

43.9 KB Created: 2020-08-08 20:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06dda732ff82b57dbde98328d317635f SHA-1: a41f6416ded5a1df04f4564d8abe84bb0b756315 SHA-256: 12160a34afa6195a8094ba8e16c7aa4791e64ca34e61f99c3cb6887d6c144e46
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one identified as a malicious redirector. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document attempts to trick the user into executing commands, likely to facilitate further malicious activity. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=bharathiar+university+m.+com+syllabus+pdf
    • http://zexisom.artbynicolamclean.com/uploads/1/3/0/7/130775320/duximuvutew.pdf
    • http://semago.helenmelbourne.ca/uploads/1/3/1/3/131383377/4764513.pdf
    • http://files.vwpitstop.com/uploads/1/3/0/7/130775983/sawesag-wuforemagaw-zavukig-zasugiwivu.pdf
    • http://files.here2helpnj.org/uploads/1/3/0/7/130739987/7046033.pdf
    • http://files.jgsnj.org/uploads/1/3/2/6/132695644/2618064.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0450/4364/6614/files/st_athanasius_on_the_incarnation.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/dorapijixanu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/jixonobub.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/99906366856.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/66400819684.pdf
    • https://cdn.shopify.com/s/files/1/0436/7374/7609/files/sufaxulozasonukoraki.pdf
    • https://cdn.shopify.com/s/files/1/0437/8584/6945/files/farudipaxuzivo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/absenteeism_rrl.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0037/files/wojupigibegezawekumopera.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/2020_chevy_cruze_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5637/files/article_370_original_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/28989587854.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c6b.bin
8eaff71726b466e99be0e1041c9b9a776d489dcfd3553174c2bbb3c21176aefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6B 5780 bytes
font_01_sfnt_off00006ff6.bin
1080155e15c7845ec5b5933130eda7c46c86c3ac956f95ce263f05105f580e51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF6 4220 bytes
font_02_sfnt_off00007e89.bin
5dda251fd663d1cd77e8cfe30522f02766e26c9ef67065457ad46a4fd94cf687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E89 9904 bytes

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