Malicious PDF — malware analysis report

Static analysis result for SHA-256 b671a531c64e1aa1…

MALICIOUS

PDF

36.2 KB Created: 2021-05-24 05:33:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cbfab7a75de14919d25394d041baf20f SHA-1: 1e9a4a2226a2f29b288981462eec666063fd0c61 SHA-256: b671a531c64e1aa11c24df226b320afa02d58f35798980e1fc5aa3fd30d7b986
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'game hacks' and 'free coins'. One prominent URL, https://netcdn.xyz/app/406889139/coin-master-daily-free-spin-app-game-hack, is identified as a malicious redirector. The document body also contains a call-to-action phrase, 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', further encouraging user interaction with these links. The presence of these lures and the identified malicious infrastructure strongly suggests a phishing or social engineering attack aimed at tricking users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-daily-free-spin-app-game-hack In PDF document text
    • https://www.cpnf.ch/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://www.cpnf.ch/images/roblox-hax_GM431946152.pdfIn PDF document text
    • https://www.cpnf.ch/images/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.cpnf.ch/images/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • https://www.cpnf.ch/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003402.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3402 24988 bytes
SHA-256: 7bd771b700a870026eea8512f9f56de098bf4857c0de96ebde9ee7b1e0c99bdb
font_01_sfnt_off00006c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2F 18308 bytes
SHA-256: f9a3a46f76b0cae8a4d9bd0baf07f2a5aefd3f4554b846be65e0119e8f17791d

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