Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91bdf3c5865b4fb…

MALICIOUS

PDF

44.8 KB Created: 2021-05-13 21:40:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 14bc6cad4349c503b1d981fb0b690618 SHA-1: 8440033bb03fe1e660ca9ec1cf4fc1e59f7050a8 SHA-256: e91bdf3c5865b4fbbcb3976d76948950c0fb7b3994396fd9e870bef4e2436762
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as generators for free game currency. The document body and embedded URLs suggest a lure for users seeking 'free Robux' or 'Coin Master' cheats. The primary malicious action observed is directing users to potentially harmful websites, which is indicative of a phishing or scam campaign.

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 https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-2021-game-hack In PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/robux-gainer_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coins-master-hacks_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-coin-master-hacks-no-verification_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_off00004d48.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D48 26496 bytes
SHA-256: 2480050882766ff1569aeb074a7601adc0853ef014abc242d2b009aedaaf9976
font_01_sfnt_off00008a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A95 19016 bytes
SHA-256: 7afc4835c6f8d200a546e15f78f642ba5dd88c8fac7df04bc3003dd1e9f7232a

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