Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbf687fdcbdec16…

MALICIOUS

PDF

42.0 KB Created: 2021-05-19 04:01:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3d3c431f54ade140d0b9cac583cae2c5 SHA-1: 82d28e3e2245c2c45625e10b5e4bc4058bcc4e4b SHA-256: 1cbf687fdcbdec164e177d24e75ad2279c69ca2708762f1a1f7e948e9606e31d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free Robux' and game hacks. The document body and embedded URLs strongly suggest a lure to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-free-robux-today-game-hack In PDF document text
    • https://dinpertan.grobogan.go.id/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/com-roblox_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/how-to-hack-coin-master-root_GM406889139.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_off00004950.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4950 24044 bytes
SHA-256: 868a17cbe5c355f387072b4225d3ebb901c2cc52d92075b47055dd8ce0bdac1d
font_01_sfnt_off0000806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 18700 bytes
SHA-256: b843f73b4bd8c826713a813afccd99a06030f2bdc38aa1865c4ca07f2f1b4e6b

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