Malicious PDF — malware analysis report

Static analysis result for SHA-256 582d9ecf8c9b08a1…

MALICIOUS

PDF

40.5 KB Created: 2021-04-25 02:30:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: baadd42cf45b4c5c92936efb80e6b57d SHA-1: 535cca33aeb18c52540fe15af8f98acd04ffd32d SHA-256: 582d9ecf8c9b08a118d51424834988a560a4de2022b9e2b53264740ba0a54230
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically `https://netcdn.xyz/app/431946152/how-to-take-free-robux-game-hack`. The document body and heuristics indicate a lure for free Robux or game hacks, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://netcdn.xyz/app/431946152/how-to-take-free-robux-game-hack In PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-robux-gift-cards-2021-25-8.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-wings-fo-free-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-robux-com-au.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-roblox-clothes-for-free-2021.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-hack-apocalypse-rising-on-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/the-plaza-roblox-money-cheat.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/is-roblox-premium-free.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-download-roblox-robux-hack.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-roblox-chaser-codes.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/robux-hack-no-verification-at-all.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_003_off000040f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40F6 25280 bytes
SHA-256: d19188863265d4c485a246c02efbf601c68395c649338eda5862e6615d9eb84d
font_01_sfnt_off00007b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B80 18576 bytes
SHA-256: 7155e675e6e318b84f9c933a3d55b03e7fba114deb5e302c64c0dbc05881df5a

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