Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80bc871dd2474cb…

MALICIOUS

PDF

42.0 KB Created: 2021-05-10 15:12:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 76bf406d1aa7306d560c75cadac224fe SHA-1: 79e416c89f18de2b703fbdc2f6d3d47ab62811d2 SHA-256: b80bc871dd2474cb056d766b3d5987091d4b46d9c772d8a27f97d60d24d3b74c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as free game hacks or generators. The ML classifier also flagged this PDF as malicious. The document body and embedded links suggest a lure for users seeking in-game advantages, leading them to potentially harmful websites.

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/free-hair-roblox-boy-game-hack In PDF document text
    • http://repository.poliven.ac.id//repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/robux-for-offers_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/can-you-get-minecraft-windows-10-for-free_GM479516143.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_off0000484d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x484D 24800 bytes
SHA-256: 1147e23a3def1403a5f5df92df0876cd8fd9a391b0abd50d48599f534e52fd54
font_01_sfnt_off0000812c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812C 18476 bytes
SHA-256: 342c800fef319d477b03ab518beae0bffc424861c275c3bcc7706f7950f542c9

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