Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37798ad69dce313…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 23:42:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4e5cc025ab54083feab88eec64a55b82 SHA-1: 86593a68305a9372dac87870a39c7cdd155dad6a SHA-256: f37798ad69dce31339f7d4f7ad371ca504591e1e34f8ccafe1f9a6a7e56b2a7f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and lures users with the promise of free game currency or hacks, specifically mentioning 'Free Robux'. The primary URL, http://netcdn.tw/app/431946152/free-robux-just-enter-username-and-password-game-hack, is identified as a malicious redirector. The document's content and heuristics suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/free-robux-just-enter-username-and-password-game-hack In PDF document text
    • http://library.darmaagung.ac.id/repository/i-hacked-it-roblox-piano_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-on-roblox-acounts_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/auto-clicker-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/roblox-girls-clothing-cheats_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-robux-scam-ad_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/roblox-car-crusher-28-hack_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/top-10-working-robux-hacks-without-verification_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/someone-hacked-my-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/free-pe_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-group-funds-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-gets-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/roblox-free-tix-2021_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/fly-hack-prison-life-roblox_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_001_off00002acf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ACF 22800 bytes
SHA-256: dff4471add5d941b305bce4006728513e8b517cd6f08f9e7952097aef87361e1
font_01_sfnt_off00005dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD7 19740 bytes
SHA-256: ca0dd26b0bef75d2603dd700b03ccf5a3b1662ca9f727b40bb5c9350a3d5659a

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