Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c23041a09af0330…

MALICIOUS

PDF

33.0 KB Created: 2021-07-04 07:01:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 36d49e4b4a29d6e95cc9a9a6fe1dca2c SHA-1: d709af728a63a22cb92e3092700486a8f1278f5a SHA-256: 7c23041a09af0330a02b033fc8a492a07206701e3af7838d65758938df2d2f9d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The embedded URL and document body text reinforce this, indicating a social engineering attempt to trick users into visiting a potentially harmful site. No scripts were extracted, but the primary attack vector is the malicious link.

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/479516143/mcpe-optifine-game-hack In PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-maps-wwii-realistic-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-800-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-no-scope-sniping-hack_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-robux-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-free-download-linux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/exploit-to-use-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/rbxf-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-minecraft-hacks_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
font_00_sfnt_off00002fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCD 21708 bytes
SHA-256: 2b9e8881023aada177b83f30e4ea72a9da5b87af3b4bd42f41ce48926fa9b998
font_01_sfnt_off00005f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F32 18032 bytes
SHA-256: 4281d751d044eda5a0802c92c9bf6cf900aad7f4c7ac23413fbf7cf459a64227

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