Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d37d987794d148…

MALICIOUS

PDF

32.8 KB Created: 2021-07-04 00:26:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9e9dbfa41af420ae0e56832aceb58c22 SHA-1: 6b74e3dddc842c89ecb6ed8154d1d99d29977ce6 SHA-256: 80d37d987794d1483475afa64b547563134d2aa939bb4c9d558453ef450c73ce
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector, specifically http://netcdn.tw/app/479516143/minecraft-cheat-client-game-hack, which is presented as a lure for game hacks. The document body and heuristics confirm the intent to redirect users to potentially harmful content. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a phishing or malware distribution attempt.

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/minecraft-cheat-client-game-hack In PDF document text
    • https://yowchang.com/image/data/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/go-to-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-powergrip-gauntlet-roblox-parkour_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/creeper-roblox-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/boku-no-roblox-free-spin-hack_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-hack-pc-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-strategy_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-clothes-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-add-robux-to-your-account-for-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/pubg-uc-567_GM1330123889.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-hack-in-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/skywars-hack-roblox_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-hack_GM431946152.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_off00002ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF0 21580 bytes
SHA-256: 6b5bd61a574d66fcb495d2d8977170da5a6d8cfa3097e8ab78d77ff3532de4a2
font_01_sfnt_off00005e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E52 18096 bytes
SHA-256: a995cd656f0262510fbde6104514bc63f73b186495f82817e83ff315ecbe0e31

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