Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c7b53e47cab535…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 03:33:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7240ac554f13876aa673c0d8f515b06a SHA-1: ea6481018e1e3ba4235d0142e6f10eaf7a31dd70 SHA-256: a1c7b53e47cab5355171d60ffaf97c647f43a61767b7cc395058afb01091c8a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a specific URL. This URL is also present in the document body and is listed as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The overall pattern suggests a phishing attempt to redirect users to potentially malicious content.

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/406889139/coin-master-new-link-free-spin-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-accounts-with-bc-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-real-gift-cards-codes-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-accessoire-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/redeem-roblox-item-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/instalar-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/best-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/this-code-gives-you-1-billion-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-created-by-robuxian_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-pokemon-brick-bronze-beta-camino-4-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-noclip-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-fun-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
stream_002_off000030d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30D0 23736 bytes
SHA-256: dff77384cb88ed64d45290aa9ae66a68400fab336f8bce1dace7c35b6c52b919
font_01_sfnt_off000066ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66BA 18508 bytes
SHA-256: 79b9a27d0053041ad6906645aa4faf6565b34a6988944d829044528d7b2e3163

Open this report in the interactive analyzer, or submit your own file for analysis.