Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27b8c6f7978b6f1…

MALICIOUS

PDF

44.4 KB Created: 2020-08-29 03:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae5cd0421c733534cdad387116e6b43d SHA-1: 4886bd316e5339fe5fd283e3b1e1aa774d1344d2 SHA-256: c27b8c6f7978b6f1092fb810d121fe5d03d81c3e7275b640be951318d4a5147e
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as a cracked software offer. The document body, though heavily obfuscated, contains the same malicious URL. The presence of a malicious redirector link and the ML classifier firing strongly indicate a malicious intent to lead the user to harmful content.

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/wix?keyword=notify+and+fitness+pro+apk+cracked
    • https://static.usrfiles.com/ugd/b8c837_fee71b3bd88146f2b0e4431291e2abf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_165395e032fc4224bbf43cdaffa0df0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_68fc379e71e04c61acf0f4fe56d9f134.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffee06910d8b4c089bd896cc3b6c75a7.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/16168214882.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/gupatenumijatopevutefizip.pdf
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/42651271756.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/96982460624.pdf
    • https://cdn.shopify.com/s/files/1/0440/7492/6230/files/boiler_tutorial.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76cb41a89294e1ebad1e8a4502a6ebb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c60d65537eb74b61a35721d0745921d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_988c0c7e86fa4635926f388796f04f61.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd0e606da71a4719a4b2f28e19449558.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062e1.bin
2f0817c157e6f5f9edf8b2c9124d7206b6324a3cb8058eeca440f5facb3f0c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E1 5040 bytes
font_01_sfnt_off00007420.bin
3deba4e8131478aa7c3ea594a7fb9e63fa63d6be57678d4a12be086c8b50844e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7420 10128 bytes
font_02_sfnt_off000096e0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E0 4324 bytes

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