Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff615d5031c155f2…

MALICIOUS

PDF

44.3 KB Created: 2021-05-13 23:00:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e3aed3875425f9494505d59860ee9f81 SHA-1: 1f6b500ebd4c9715a9bee7baf63498ba9de631fc SHA-256: ff615d5031c155f26faed6e278e8706872848e5bfb6a8b1861d95000b8d767c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as 'free generator' or 'game hack' lures. The document body, though heavily obfuscated, contains references to 'Free Robux Codes' and the malicious URL. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern is social engineering via a malicious link.

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 https://netcdn.xyz/app/431946152/free-robux-codes-game-hack In PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/static-moonactive-net-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-2021-android_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_003_off00004d2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D2D 26628 bytes
SHA-256: 1cc3a1853340428f7cfdfcac33e0b9abb7335bc591c3bc9df8fd0dbb56b0aa2e
font_01_sfnt_off00008b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B70 18188 bytes
SHA-256: 7763b0eba74f003993d6ddc379ef756dfeeff7cedd1b34d70c41f8674d393ab3

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