Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd72d0691d3a4dc…

MALICIOUS

PDF

49.2 KB Created: 2021-05-13 13:31:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 96b3507ca1a1b7940a67ccefaf0a3fcc SHA-1: 09c90356c4301119bb92af22e99717a7f425d7ea SHA-256: 3fd72d0691d3a4dce8b69f33d4f8dd327c6cf3cdd691f0302878d618ffd4297b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a game hack lure, directing users to a known malicious redirector URL. The document body and embedded artifacts also contain references to this URL, reinforcing the malicious intent. The primary attack vector appears to be a phishing attempt via a malicious attachment, likely leading to further compromise through the embedded link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0145

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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://netcdn.xyz/app/406889139/coin-master-spin-cheat-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000035cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35CC 26284 bytes
SHA-256: 1e0cbe13819186cfd85a73fd82c10348671ce090e4945ea41e5f07121411c13b
font_01_sfnt_off00007386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7386 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off00007e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E51 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off00009177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9177 17888 bytes
SHA-256: 6e952cda52cab557889c44e050e091d78c8f903a1a78f0754c4b08395fb72fca
font_04_sfnt_off0000b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24B 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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