Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e733cc0192022a…

MALICIOUS

PDF

34.8 KB Created: 2021-06-20 15:47:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9b59df761fc75dcbbe43165fac107ff1 SHA-1: 98515bea2f6f1f045944be58f5fc13c87121d472 SHA-256: a4e733cc0192022ab2c3616cb09b9a177760787d426659b10f1173540b6339f2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a primary URL identified as a malicious redirector. The document body and heuristics indicate a lure for 'free Robux' or game hacks, designed to trick users into visiting the malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or scam campaign.

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/earn-free-robux-9nline-game-hack In PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/roblox-free-hair-boy-2021_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-get-free-robux-2021-100-works_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/roblox-game-pass-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/lazyblox-com-free-robux_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_off0000307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307B 22592 bytes
SHA-256: 3212eb7f3bfe5c20e04f320a53777ccd34806fc3e3016323cfd110c6518fb2fd
font_01_sfnt_off0000630c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630C 19072 bytes
SHA-256: 5ed6145cdb2ab5d5e59f7969aecc1870395d61558452780f70d09654ab91abbc

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