Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f152bdd7bee0fd…

MALICIOUS

PDF

41.5 KB Created: 2021-05-10 14:00:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ca4adcfe204753672e9e7369f677d229 SHA-1: fcfcc9f52a71ebc0e98fe2ed2bc22c42f2b50696 SHA-256: a3f152bdd7bee0fdef4485fb7748b72b3590baf68f1659e0998f6b93769df697
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector domains, including one that masquerades as a 'free generator / game hack' and leads to a fake CAPTCHA. This is a common lure to trick users into downloading further malicious content or executing arbitrary code. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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-codes-no-verification-game-hack In PDF document text
    • http://pwpyemen.org/images/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://pwpyemen.org/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/free-robux-link_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_003_off00003d62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D62 28604 bytes
SHA-256: 3f063df36bcb48eada3e4ae69fb49ffa85df1f613319466fd73238d654282f8e
font_01_sfnt_off00007f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F53 18776 bytes
SHA-256: 1501cc25bcf8c3b3bf9df14f68216c1cc39cc5b0131e4343b63bafa21afb9c06

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