Malicious PDF — malware analysis report

Static analysis result for SHA-256 35498bb3a79ece60…

MALICIOUS

PDF

45.2 KB Created: 2021-05-10 17:21:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3c3e2d8c0dc97c40298caee02b5f722c SHA-1: f94f1e781a4ce35b1d1dfecde6610d66960a01a3 SHA-256: 35498bb3a79ece60dacb6619aa2415890597133b343ef5bb5d9424c707d475bd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are part of a link farm designed to attract traffic for game hacks and free currency. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. While no scripts were directly extracted, the PDF structure and embedded URIs suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/google-play-coin-master-free-spins-game-hack PDF link annotation
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-cp_GM431946152.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-pe-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/master-coins-free_GM406889139.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-hack-download_GM431946152.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_003_off00004b60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B60 24392 bytes
SHA-256: b0e048dc0b8f883a4079e6acfa8b2c0c7629a9ae135203d0f328d5cc7fb78e0b
font_01_sfnt_off00008256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8256 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off00008d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D59 18580 bytes
SHA-256: 159b8c9b1a2eefbbab3f5eb8e11562dfe96c3187e7709bb0bd16e4420bc442bb

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