Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f3f375fd8819c6…

MALICIOUS

PDF

33.4 KB Created: 2021-06-26 10:47:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 91b2fd80d5be4783b88033ffd0a8f66f SHA-1: 4b0c09c0e61ad25d6743ad6af2350ef53c4f3e57 SHA-256: b4f3f375fd8819c6363642916ddd8865e656ac792cbdb79b74a00b678fe60de2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to known malicious infrastructure. The document body and embedded URLs suggest a lure for game hacks and generators, likely intended to trick users into downloading malware or visiting phishing sites. No scripts were extracted from this sample, but the presence of malicious redirectors and the lure content strongly indicate a malicious intent.

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 http://netcdn.co/app/431946152/roblox-com-hack-robux-game-hack In PDF document text
    • https://www.wessexandrology.com/uploads/files/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/how-does-roblox-gg-hack-your-acc_GM431946152.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/roblox-nike-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/pokemon-go-free-hack-download_GM1094591345.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/tiktok-free-palestine_GM835599320.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/free-robux-generator-no-human-verification-no-survey-or-offers_GM431946152.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/free-roblox-codes-2021-november_GM431946152.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • https://www.wessexandrology.com/uploads/files/files/comment-avoir-des-robux-gratuitement-sans-etre-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB2 21652 bytes
SHA-256: eb11a0e459f53685aa7716e3c27fda0f6cae4137b8b7224415070efad21d29ff
font_01_sfnt_off00005d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D55 19056 bytes
SHA-256: b80e749aa6c7dc82bfa18ca001acc60fa2a01795ff464af35a1169a98ae6bdcf

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