Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20448009486dcd5…

MALICIOUS

PDF

34.5 KB Created: 2021-06-19 14:57:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ccd40ad62bc7311325c88071dc645105 SHA-1: 98b86ad805fa48ccee1ecfd3c579c4643e262543 SHA-256: f20448009486dcd5fdf11c6d1fdf62b5f9f1db59844ada8dba9450bd9b6d1b9e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering 'free Robux' or 'game hacks', which are common lures for phishing and malware distribution. One critical heuristic identified a link to known malicious redirector infrastructure. The document body and embedded URLs strongly suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

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.co/app/431946152/how-to-get-free-robux-for-free-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/free-star-wars-group-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-miner_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-accounts-with-robux-2021-may_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-no-offers-no-verification-no-surveys_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-jailbreak-noclip-and-speed-hack_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
stream_002_off00002f2e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F2E 22512 bytes
SHA-256: c33429c9378b696f3ab42348dac623482f94bbdb7d9c7d318f7c0f1f9731fbdc
font_01_sfnt_off000061cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CB 18984 bytes
SHA-256: b02f235e187ca63825268846ce24859b9c73d6f06522f0e44481555b58ecada8

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