Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c61fb79c01cae18…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 20:07:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dfec3a7fb5e45f191071f467280c790e SHA-1: 5d42430901a793307b21eadb6877363f09edadc8 SHA-256: 6c61fb79c01cae1811441ea29760d33449820b23bc4861c8bf2cc7b24485e9e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/431946152/to-get-free-robux-game-hack. The document body and heuristics indicate a lure for game-related cheats or currency, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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/to-get-free-robux-game-hack In PDF document text
    • http://smpn1sda.sch.id/slims/repository/robux-offers_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-magic-training-hack_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-vehicle-simulator-free-vip-server-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-face-robloxcom_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-roblox-gamepasses-2021-easy_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/robux-free-2021-com_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-the-chill-turtle-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/robux-hack-tampermonkey-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-glitches-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/pokemon-brick-bronze-roblox-hack-phone_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-and-tix-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-in-roblox-pc_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-unlimited-spins-apk-free-download_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_off00002f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F91 22168 bytes
SHA-256: feac1bb4d08a3c4adf5e30707871107eec940cc54a36d665a122d3db7c74718a
font_01_sfnt_off000060cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CF 18820 bytes
SHA-256: 8945f1685ed6de98f8048baf7c49d81d2d868232d273679e20707c637152a071

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