Malicious PDF — malware analysis report

Static analysis result for SHA-256 af72af8894cdc846…

MALICIOUS

PDF

33.4 KB Created: 2021-07-07 04:41:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7d2b6bf9d11a24ad81e9dc68042f2ad5 SHA-1: 36b2071d1368e8e3f3f62481c20e498541f2d089 SHA-256: af72af8894cdc84616bb1f10d2d166f8fd1cf49a9f682dd8ebfd5e5ef429380d
160 Risk Score

Malware Insights

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

This PDF document is designed to lure users into clicking links related to game hacks and free in-game currency, such as Robux. The primary link directs to a known malicious redirector infrastructure, which in turn hosts multiple other malicious PDF files. The ML classifier strongly indicates maliciousness, and the presence of multiple redirector links suggests a campaign to distribute further malware or phishing content.

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/431946152/roblox-hack-unlimited-robux-game-hack In PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-robux-iphone-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/hackear-roblox-gratis_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/rbxnow-gg-get-free-robux-on-roblox-playing-games_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/invisible-head-roblox-free_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/robux-app_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-cheat-noclip-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/account-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/demon-roblox_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-free-items_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/easy-robux-today-com_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_off00002d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D59 21512 bytes
SHA-256: c1dcbe3bc265843aab7f4d47d68d5492e3636e2fbfeca42c336fcaeec578f1dd
font_01_sfnt_off00005c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4A 19452 bytes
SHA-256: c21e99ebfc9f7e5f39e71a68abf279300e15561c35a4934f0c8f70bb34e99d3b

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