Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7a0d0d146f3175…

MALICIOUS

PDF

39.4 KB Created: 2021-05-22 17:41:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d70f3de6bf798f9797220bf0ee8f8efe SHA-1: 4e252798f4839a09434521329e2e0be81388edd7 SHA-256: 0f7a0d0d146f3175133933ad90b74999358f2a95c73efd73d8fb0504898f0377
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for a "free generator / game hack" and displays a fake CAPTCHA to trick the user. It links to malicious redirector infrastructure, specifically the URL https://netcdn.xyz/app/431946152/free-robux-working-game-hack, which is designed to lead users to further malicious content. The presence of a fake CAPTCHA suggests an attempt to trick users into executing further actions, potentially downloading or running a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/free-robux-working-game-hack In PDF document text
    • http://leagueforwomenrights.gr/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/how-to-get-free-robux-without-verification-or-surveys_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_off000033e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33E8 29792 bytes
SHA-256: 70ade4710dc571de642c8a6cfe1eea19edb73120e219069a0d4745b99260309f
font_01_sfnt_off00007768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7768 18788 bytes
SHA-256: 146362cb081aa7c6718ebc51132ca2538876dc1922f8d33668898621d3d02efe