Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1455266b5c3579f…

MALICIOUS

PDF

42.2 KB Created: 2021-04-28 21:10:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a7385916a9f5400ae804d54361f75df2 SHA-1: 49c7fee42a36bd4fa738aca930c4e695f5b33af9 SHA-256: e1455266b5c3579fca81f6107f278ee7b3bbea070c8b937898e193702e9d0b20
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free promo codes for Roblox' which links to a known malicious redirector. This redirector is designed to funnel users to potentially malicious sites, likely for credential harvesting or further malware delivery. The presence of multiple related PDF files hosted on malesse.com suggests a coordinated campaign.

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/get-a-free-promo-codes-for-roblox-game-hack In PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-hack-pc-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-obby-limited-time-only-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/no-virus-hack-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/crimson-roblox-hack.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/robux-hack-no-download-or-human-verification.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-hack-for-android-apk.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-hack-no-verification-or-survey-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-list.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/how-to-get-free-robux-without-a-human-verification.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-hack-de-jailbreak-roblox.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_off000042eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42EB 27348 bytes
SHA-256: 1d6d8c8e8558758f110f974bfe6837a453e672c58e2c3e31559ef30f80232141
font_01_sfnt_off0000824f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x824F 18640 bytes
SHA-256: ae84b222478760f2ca58c2e0f5bb6f9561e1f444fb1a9b2cd383289b81ac2937