Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c522078ad4b8aaa…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 20:20:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1cc978edcb250fc84b0e2a1671c16700 SHA-1: 36405fb5e1eea60780a4a9a989b79d203719a31a SHA-256: 4c522078ad4b8aaa86064fc8b06819829c8c49d00f55b3b81b015e734ff20ebe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector, specifically advertising free game hacks and currency. The document body and heuristic firings confirm the intent to lure users to these malicious links, which likely serve as a gateway to further malicious content or phishing pages. No scripts were extracted from this sample.

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.co/app/431946152/v3rmillion-free-robux-game-hack In PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/earn-robux-online_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/rbx-robux_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/get-free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-gift-card-pin_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-trader_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/hacks-for-roblox-phantom-forces-2021-august_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-ios-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-codes-2021-and-how-to-imput-them_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
font_00_sfnt_off000030df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30DF 22276 bytes
SHA-256: 5228ec2fcde09fa757de87cbee11f28e66a5a36a84fd70072a17c099cf67b71b
font_01_sfnt_off0000622e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622E 19476 bytes
SHA-256: 09959c899f7b0faaf38b60d3355e18102baa0a89a25348d68bd2c703a89dc2c7

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