Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ac9fa0e4564750…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 20:00:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7b5c93be695180f4841a5d6d135b0323 SHA-1: a9fc4ed3e2419c3a659bc39acdb326fd6a4987cd SHA-256: 70ac9fa0e4564750925d39d5b47068d6e456aefc93eb9dfe320dfc741fd74e94
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, including a known malicious redirector, under the guise of game hacks and generators. The document body and heuristics indicate a lure for free game items, likely leading to further malicious content or scams. No scripts were extracted, but the overall structure and linked content suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/http-appsmob-info-coin-master-hack-game-hack In PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-on-roblox-xbox-one_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/infinite-health-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-roblox-without-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/codes-jeu-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-onligames-like-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-lumber-simulator-2-hack-script_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-limiteds-comlu-com_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-synapse-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-cp_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-adidas-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-items-that-you-can-get-for-free-right-now_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/6-21-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-royale-high-free-vip-server_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-create-items-in-roblox-free_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_off00002f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5D 22744 bytes
SHA-256: bea03e254ef42580595e2f658ccd3507cd3b17c6e3c500346436c5cbb1521d5b
font_01_sfnt_off0000624e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624E 18600 bytes
SHA-256: a4ef4840d49e767f522fe62d569c023cf90c73cf43765e13b0ba0217dd54045f

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