Malicious PDF — malware analysis report

Static analysis result for SHA-256 213683fc36cf87b7…

MALICIOUS

PDF

52.5 KB Created: 2021-06-07 22:11:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3a2653a59ca05fa2d0128e37990b12f0 SHA-1: 72d9791f862b8c9ba63081a3bc8c3f9a2896e123 SHA-256: 213683fc36cf87b7749ed3c29873af74fa16b84f3ec61d7107f7fa37d8265161
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, identified as a link farm, that redirect to pages promising free game currency or hacks, such as 'free robux'. The primary lure URL is https://netcdn.tw/app/431946152/how-do-u-get-free-random-robux-on-roblox-game-hack. This suggests the document's purpose is to trick users into visiting malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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.tw/app/431946152/how-do-u-get-free-random-robux-on-roblox-game-hack PDF link annotation
    • http://arkivthy.dk/images/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-shadowrun-skip-cheat-codes_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-gratuit-manete-free-box_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/add-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • https://direct-link.netIn 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_004_off00005351.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5351 37968 bytes
SHA-256: 4532c23b22ef2279b0e0eac0700355d051bc83c1ac8d2b83683c7f61fd4cc30d
font_01_sfnt_off0000a7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7EC 19372 bytes
SHA-256: 74d99224d2920162238b0f9c555d7559f801f8668e61ba712991df4476966224

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