Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e8d0b99c8c848d…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 23:58:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 234c3ae718f503ad488bf2ed5f097bca SHA-1: 2cb27c4d8c9d9cf62751ac5c34c80361a9a201ec SHA-256: 53e8d0b99c8c848d14367a3ebbc1c0632a57c6a03b9508d3e227b96f13e2c731
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector, masquerading as a generator for free game currency like Robux. The document body and heuristics indicate a lure for free game hacks, which is a common social engineering tactic to trick users into visiting malicious sites. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/robux-for-kids-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-hack-in-roblox-jailbreak-on-ipad_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-tiktok-app_GM835599320.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/codes-roblox-pants-hacker_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/prison-breaker-16-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/zombie-rush-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/pokemon-go-free-zip_GM1094591345.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/daily-spins-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
font_00_sfnt_off00002f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F54 21968 bytes
SHA-256: 35e785420e9e863817267c2166867e2f2b37d10d7eb1b3ab82b7a3af307f31a4
font_01_sfnt_off00005fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBD 19012 bytes
SHA-256: 8020a23b7ddb9411bf645835d14aa85f4a72b1b9a4a728149e9f7b12692e21b9

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