Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f466fe6dbada5c…

MALICIOUS

PDF

37.2 KB Created: 2021-05-22 23:01:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e52016ed59fd879d37bc2183bdd48cac SHA-1: 1e96a759fe2f46d2f10220ce54cdc02b5d913cd6 SHA-256: 48f466fe6dbada5c0aed7b3ba9ea228d887a18556c28f5710bd6cbffe5c5a6db
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1204.001 User Execution: Malicious Link

The PDF document contains multiple links to known malicious redirectors, disguised as "free generators" or "game hacks" for popular games like Minecraft and Roblox. It also employs a remote support lure, suggesting a social engineering tactic to trick users into downloading potentially malicious software. The presence of these lures and malicious links strongly indicates an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://netcdn.xyz/app/479516143/minecraft-java-free-game-hack In PDF document text
    • https://royalhelmet.com.vn/ckfinder/userfiles/files/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • https://royalhelmet.com.vn/ckfinder/userfiles/files/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://royalhelmet.com.vn/ckfinder/userfiles/files/fake-robux-codes_GM431946152.pdfIn PDF document text
    • https://royalhelmet.com.vn/ckfinder/userfiles/files/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://royalhelmet.com.vn/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_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
stream_002_off000036f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36F9 25868 bytes
SHA-256: cd2708cc17bd0b117f743cb584ebb6b79c9e56bde3a54b40ffb627daafcaf819
font_01_sfnt_off000071b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B4 17848 bytes
SHA-256: c651dee67b00b36100d0c208f30a7974f38e9c4fefacd489da3c8fda34869f62

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