Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dd241d1e2149ca…

MALICIOUS

PDF

33.5 KB Created: 2021-07-09 11:37:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e6619ac83b60f9c7b09d26f3d9f77c35 SHA-1: 1d469038ff392ecf1dcada6998749aa6a8aea38f SHA-256: 89dd241d1e2149ca611f19a94aff372d04c02408e87f1197fefaf17f43b10ece
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, http://netcdn.tw/app/431946152/freerubux-game-hack, which is designed to lure users into clicking on promises of free game currency or hacks. The document body and embedded URLs reinforce this lure, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a high likelihood of a malicious workflow, likely initiated via spearphishing.

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.tw/app/431946152/freerubux-game-hack In PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/roblox-army-robux_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/how-to-hack-jailbreak-money-roblox_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/spam-hack-roblox_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/roblox-how-to-make-audio-for-free_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/roblox-jump-fly-hack_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/coin-master-com_GM406889139.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/roblox-hack-prision-life-2021_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/robux-come_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/how-to-get-any-gear-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-coins-coin-master-link_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
font_00_sfnt_off00002e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E68 22060 bytes
SHA-256: 12b010eadd9a57f95951f8483456d2862417ecba97e021362b6487df27627172
font_01_sfnt_off00005f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 18572 bytes
SHA-256: a4910544a3301e21d5425f47d387c0dcd2b1454e32e0c532c02705c370365377

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