Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a8d9f507c2ac07…

MALICIOUS

PDF

36.1 KB Created: 2021-07-08 12:06:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 504ccdfc0d05768347ab89e07dc2062d SHA-1: fc085bbbba30b74f919debfabb92a179a8a7f49f SHA-256: 85a8d9f507c2ac07c30fa5b44cdabd98a80e4db140f13c88f898ad55fb179e59
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to redirectors and link farms, specifically advertising 'free Robux' and game hacks to lure victims. The heuristic PDF_GAME_HACK_REDIRECT_LURE directly indicates this malicious intent. While no scripts were extracted, the embedded URLs and the nature of the lures suggest a phishing or scamming attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/431946152/free-robux-just-enter-username-and-password-game-hack In PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-for-free-no-money-unblocked_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-pc-hack-download_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-generator-and-v-bucks_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/hack-adopt-me-roblox-download_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-get-followers-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-hack-on-roblox-without-cheat-engine_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-no-offer-real_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-get-free-robux-by-playing-games_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
font_00_sfnt_off000034f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34F5 22320 bytes
SHA-256: e6721980206d723fe87eacbba1a05576e54399a8f131198297af53bb3cf17505
font_01_sfnt_off00006654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 19740 bytes
SHA-256: ca0dd26b0bef75d2603dd700b03ccf5a3b1662ca9f727b40bb5c9350a3d5659a

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