Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5cf023acceb691…

MALICIOUS

PDF

42.8 KB Created: 2021-05-16 19:56:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 40c355bafe279b63e27cb08abba45ebf SHA-1: 4c7fde2d68c86658d6d410a7a67382cb7a1e3393 SHA-256: 1e5cf023acceb6918deb60faf2073785f06f523019e613f0fd83028bb5a5faf0
220 Risk Score

Malware Insights

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

The PDF document contains multiple links to websites offering "game hacks" and "generators," which is a common lure for phishing or malware distribution. The heuristic firings indicate that the document links to known malicious redirectors and attempts to solicit sensitive information like recovery secrets. While no scripts were directly extracted, the nature of the lures and the embedded URLs suggest an attempt to exploit user interest in game cheats to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://netcdn.xyz/app/406889139/coin-master-hack-ios-apk-game-hack In PDF document text
    • http://nod74.ru/images/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://nod74.ru/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://nod74.ru/images/real-robux_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-hack-spins_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://nod74.ru/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://nod74.ru/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/roblox-studio-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_003_off00004d3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D3D 24864 bytes
SHA-256: 4970ae885fa0a9d1eaa4ffcee4afd752fd20c7843d3ab687ab98b13da7bc43a9
font_01_sfnt_off0000863c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x863C 17892 bytes
SHA-256: c18f05485291fd9dd2d982fa815b69c2a1f9afc9df9b250f8ccfc4cbb8514acf

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