Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35bd028211b2b5a…

MALICIOUS

PDF

38.7 KB Created: 2020-09-03 09:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cee0b1e5ac4e5f41227c44c089c9643d SHA-1: a1b322a086767619cc9b3ab41a59d670ac255635 SHA-256: f35bd028211b2b5a088ab4611c74a5cc1f2cf8b911673ef6d8b3ee90dee7238c
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to a URL that promises a 'samsung bypass google account verify apk'. This URL is likely the primary payload delivery mechanism. The document also contains a large number of embedded links to external PDFs, a common tactic for SEO poisoning or link farming, with the primary suspicious URL being ttraff.club.

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.
  • 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
  • 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.club/wix?keyword=samsung+bypass+google+account+verify+apk
    • https://static.usrfiles.com/ugd/69a512_2e6820a7733e4357b121df2a857fecdb.pdf
    • https://static.usrfiles.com/ugd/3bf302_4153c837f6134a6cae8dd26f617c4349.pdf
    • https://static.usrfiles.com/ugd/ce5d00_d31ed70e56d94cf8b3b7e0c193d5cadf.pdf
    • https://static.usrfiles.com/ugd/b8c837_26b58eef2d594002986b9e92037c8a4b.pdf
    • https://static.usrfiles.com/ugd/b5472a_86e234b50ade4b56a1d92702b8cdd2f1.pdf
    • https://static.usrfiles.com/ugd/0c60a0_6b47a8cdc38948ffb516765809edb04f.pdf
    • https://static.usrfiles.com/ugd/e3ff21_70adef58fdd34cadb32cb5487f30cc4b.pdf
    • https://static.usrfiles.com/ugd/9b5f63_e754f89a08d64d128c4a77ad5634a716.pdf
    • https://static.usrfiles.com/ugd/b8c837_63f03e14d82443f094a9e04d2b651b2a.pdf
    • https://static.usrfiles.com/ugd/c1de29_06011d433b9947f883a4b5673ef07592.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_off000058b3.bin
570b973bb20b48397bc6a4f46f34e6d4f7cc8dceb1c5e80dd5e42f7282024907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B3 5804 bytes
font_01_sfnt_off00006c71.bin
5c38b046444706ed9f070fef359a1b2ecf8e15aedd44f8435772a2ab6f1060b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C71 9964 bytes

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