Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4c21b2df446412…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 09:36:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6b521002016ce66418de35091e45ca11 SHA-1: 6a44195794f1c9b68d3b6b636ed5ff5d17165760 SHA-256: fe4c21b2df446412b1ed11915df62100cfa14214ba258284e02cd34e6686504e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, indicating a phishing attempt to trick users into visiting a malicious site. No scripts were extracted, but the overall pattern suggests a social engineering lure to drive traffic to a potentially harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/boost9-com-roblox-hack-game-hack In PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/100-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-cool-free-skins_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-live_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-give-robux-on-mobile_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_off00002c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C96 22324 bytes
SHA-256: ddd0fc6375a01a9f6e2fbc53f8d5e675698a206f4ba447456f32ba456852b288
font_01_sfnt_off00005dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDE 19184 bytes
SHA-256: 707c7d097227c5a2bffd226d5c5532f32e87254070a1c225c5526738dc78e9a7

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