Malicious PDF — malware analysis report

Static analysis result for SHA-256 c193b4fba442d350…

MALICIOUS

PDF

41.5 KB Created: 2021-05-10 17:04:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f54b51839df2b557e142220d8b269400 SHA-1: f576877c2115060be5cb51f4d3268b6b7e7e4bea SHA-256: c193b4fba442d3502ce570c32c6ce7e9a323b7734aeb3c93099a8e54aa0a8e6b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body, though partially obfuscated, contains similar themes and URLs, reinforcing the phishing pretext. The primary intent appears to be directing users to potentially harmful websites through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-robux-without-verification-game-hack In PDF document text
    • http://fobh.net/userfiles/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004410.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4410 24996 bytes
SHA-256: 5f4c208bf9d06ba8b4e7b862530be6ca594061ee7b990074e564e6ca842319b4
font_01_sfnt_off00007de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE0 18964 bytes
SHA-256: 5864977637737ef4e1bd5b7bfc66e5602b8aa3d3ed60f74fb5f96fd63c3aa8ef

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