Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1cf44b45afdbb7…

MALICIOUS

PDF

33.6 KB Created: 2021-07-05 07:41:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ce16e999d1a7fa39d8bc46b394ba5d3 SHA-1: 377f1bd95c07331b19111b97fb8f6165639a22ff SHA-256: ca1cf44b45afdbb7ec24f4f642d6099f5fb7bb29ea1b2a06958846950f3660a1
180 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, including a known malicious redirector infrastructure at http://netcdn.tw/. Additionally, it links directly to IP addresses hosting files that mimic game-related applications, suggesting a lure for users seeking cheats or generators. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/robuxmatchcon-game-hack In PDF document text
    • http://183.91.70.7//repository/coin-master-rewards-app_GM406889139.pdfPDF link annotation
    • http://183.91.70.7//repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://183.91.70.7/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/free-coin-app_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/como-hackear-robux-en-roblox-con-cheat-engine-66_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://183.91.70.7/repository/roblox-hack-tool-apk_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-free-coins-and-spins-link-2021_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
stream_002_off00002cfc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CFC 22044 bytes
SHA-256: 0b63cbbe694a504e467bd24ef2ab148443dce539a278d703ffb43e236b196e51
font_01_sfnt_off00005df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF9 19084 bytes
SHA-256: 22fb853357d700a883506443e03244379ebe89dfe763389f41fb0df375e68649

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