Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8905ee1e9207a0d…

MALICIOUS

PDF

41.8 KB Created: 2021-05-15 01:43:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d3e3ffbad805aeb2f98a960ed9983a63 SHA-1: cf25ad48f89d4f2a11b1e4290a958f353091d544 SHA-256: c8905ee1e9207a0db09fbd7e54b120842dcdf62a64efa5b09e889f11afd9f636
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF contains multiple links to malicious redirectors and impersonates Microsoft to lure users into clicking on a "Robux Claimer" or "game hack" generator. The primary link, https://netcdn.xyz/app/431946152/robux-claimer-game-hack, is associated with known malicious infrastructure and likely leads to credential phishing or a second-stage malware download. The document body and heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/robux-claimer-game-hack.
  • 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/robux-claimer-game-hack In PDF document text
    • http://beautyforyou.fr/images/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://beautyforyou.fr/images/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://beautyforyou.fr/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://beautyforyou.fr/images/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://beautyforyou.fr/images/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://beautyforyou.fr/images/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://beautyforyou.fr/images/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://beautyforyou.fr/images/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://beautyforyou.fr/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://beautyforyou.fr/images/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://beautyforyou.fr/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://beautyforyou.fr/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://beautyforyou.fr/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://beautyforyou.fr/images/robux-today_GM431946152.pdfIn PDF document text
    • http://beautyforyou.fr/images/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://beautyforyou.fr/images/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://beautyforyou.fr/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://beautyforyou.fr/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://beautyforyou.fr/images/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://beautyforyou.fr/images/minecraft-windows-10-free-with-java_GM479516143.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_off0000475f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x475F 24684 bytes
SHA-256: e8b8273f17cbf883fed8044b5bf6a1eed9aa5f3cf048f7ac387498ce88154dfb
font_01_sfnt_off0000805c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805C 18532 bytes
SHA-256: f8d3cbf6c99adbc4a00682e2952441b72e35b63b7e0e02c452fe01b9b955693e

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