Malicious PDF — malware analysis report

Static analysis result for SHA-256 d636106a3e0a8fbb…

MALICIOUS

PDF

47.9 KB Created: 2021-06-08 12:06:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f6156d19d73605059297f96277bf361f SHA-1: 68b6931d107b0c3ac445a005c0db123f3e50305b SHA-256: d636106a3e0a8fbb3dfdd6e32cb57ec1f3e717715393a3839ebe67d887a31839
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'free generators' and 'game hacks' for popular games. One prominent URL, 'https://netcdn.tw/app/431946152/free-stuff-on-roblox-pastebin-game-hack', is flagged as a malicious redirector. The document body, though partially corrupted, also contains references to similar lures and the authoring application suggests it was generated programmatically, likely to host these malicious links. The presence of embedded URLs and the nature of the lures strongly indicate a phishing or scam attempt designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-stuff-on-roblox-pastebin-game-hack In PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/what-is-robux_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/get-me-robux_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://pariwisata.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fbd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FBD 25200 bytes
SHA-256: 96f69808d9ad484eee3aae93081139c9009e2d0a94938c5d1a851f5e6d156b1a
font_01_sfnt_off00008a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7B 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9723 18696 bytes
SHA-256: 420af37aadfc3b4547264d921ae2fcf430086613322005b8abcab26273b8752e