Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5882a81e8a5be5…

MALICIOUS

PDF

46.5 KB Created: 2021-05-16 17:17:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8754ee29e01f01fa9d61438434f9f2b8 SHA-1: d1a37b8e3d35ff7e97bced7dced9792019fa1807 SHA-256: df5882a81e8a5be515fc847d88a5a1e778ac3c6b3ae24ffb14d37bea289216ed
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to malicious redirectors and game hack lures, designed to trick users into believing they are getting free Robux or game cheats. The document body and heuristics indicate a fake CAPTCHA and secret recovery lure, suggesting an attempt to steal credentials or prompt users to execute further malicious actions. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/how-to-get-free-robux-without-verifying-game-hack In PDF document text
    • http://www.ladillo.com/images/robux-claimer_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://www.ladillo.com/images/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://www.ladillo.com/images/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ladillo.com/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.ladillo.com/images/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.ladillo.com/images/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.ladillo.com/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://www.ladillo.com/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ladillo.com/images/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://www.ladillo.com/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://www.ladillo.com/images/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48EF 26544 bytes
SHA-256: c1053f5d0ec7799b07b657b87e1d4c40ececc6042c8860c700628aa7e3866364
font_01_sfnt_off00008622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8622 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off00008fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE4 19368 bytes
SHA-256: 63de63cfc252acdf530e8b3b2390dbc20d855d9653817057ed506b48c41b68ab

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