Malicious PDF — malware analysis report

Static analysis result for SHA-256 253939626ea94e2a…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 03:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b13ed7d6f0dbd1150fbad7c926436140 SHA-1: 5ccfe0a7ded93bbdf8c615ea1c7a56957a07093a SHA-256: 253939626ea94e2aa15648545190627a25bc887d5e676fc106bd569488321a7f
150 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a known malicious URL, disguised as a game walkthrough. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also contains a large number of external links, indicating a link farm for SEO manipulation, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL.

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/wix?keyword=pokemon+dark+rising+2+gba+walkthroug
    • https://static.usrfiles.com/ugd/8b49c6_1453bb0af6464354996e26e6b0975d98.pdf
    • https://static.usrfiles.com/ugd/b8c837_0425a56518024801944dc1c0f3b7465b.pdf
    • https://static.usrfiles.com/ugd/4c1554_2f1399b286864054a325dcad0296e756.pdf
    • https://static.usrfiles.com/ugd/b8c837_efecfac215454b0e9be89bf658fd3c9b.pdf
    • https://static.usrfiles.com/ugd/b65acf_43ba35f3502a4674bcda337685d8097a.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5227/files/ant_video_er_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2589/files/kesuditakoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/agenda_2020_francais.pdf
    • https://cdn.shopify.com/s/files/1/0435/3156/7256/files/83349885373.pdf
    • https://cdn.shopify.com/s/files/1/0434/5525/0598/files/zuvedobevozozezifukajova.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/xudidotimu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/21768932387.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/8531932424.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/media_creation_tool_1903_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/wawodef.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_off0000620d.bin
fcb651ce26456b5c1c72cb3659921d5366d7942f87b300507bc74c4ce0e441f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620D 5668 bytes
font_01_sfnt_off00007538.bin
706bb68d45c8bfff2b2691445914469aa629a44d2d4a91563297ec794814d66b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7538 11068 bytes

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