Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac513c5807b8b801…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 04:45:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 02abe0d1813dd08f20b84738cbee7415 SHA-1: 0eccebc9bccb3698215aaf389bc7fd3abb886516 SHA-256: ac513c5807b8b8010683f5407a8bd8818fb2f4ad8257418ff68a122067d82904
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a site offering game hacks, specifically mentioning 'Robux'. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the ML classifier strongly indicate malicious intent. The document body and embedded URLs reinforce the lure of free in-game currency or cheats, a common social engineering tactic to trick users into downloading further malware.

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/a-lot-of-robux-game-hack In PDF document text
    • http://www.manchieu.vn/upload/editor/files/fly-hack-roblox-jail-break_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/minecraft-client_GM479516143.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/fly-hack-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/wwwrobloxcheat-de_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-get-a-free-radio-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-sell-an-shirt-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/roblox-apk-hack-mega_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/redeem-code-roblox-free-2021_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-get-free-adminon-roblox-for-any-game_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/free-noclip-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-get-hack-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/roblox-free-printables-party_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_off0000300b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300B 22044 bytes
SHA-256: 180b4a37254d53f96623d2c2d079479176ed5c1a00208a16e1d771ef8c67ff43
font_01_sfnt_off000060af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AF 18656 bytes
SHA-256: d04e08575e4efc43ec371b195521181e13837c014caa8c6a2ad7539eeb3e7d8e

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