Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba86cb9545ff1b0…

MALICIOUS

PDF

38.4 KB Created: 2021-05-10 15:13:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 12e084214c894934fa83fd2906c20168 SHA-1: 164b2340d8e2378fce9c327a51f0dd06053ba0d5 SHA-256: 4ba86cb9545ff1b0d698bfe9151b5c27e0366df0a45462fbcd7a69369f86e818
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that lure users with promises of game hacks and free generators for popular games like Coin Master. The heuristic firings indicate that these links redirect to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-links-coin-master-game-hack PDF link annotation
    • http://zercalo.org/images/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.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_off00003e5e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E5E 24140 bytes
SHA-256: 3b8e1639d842191f72cc2cb02dbeabe441e39d4f1ee16cb9813bc713b2b9e9ea
font_01_sfnt_off00007553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7553 17880 bytes
SHA-256: c5130e18caf6f7222c4492e4e2e2fc6b4580e14129763dcab090a363ad6db2dc

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