Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f075d7c3583dc8…

MALICIOUS

PDF

44.2 KB Created: 2021-06-13 18:21:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ba49ec220197df2a59ef2c23875611cf SHA-1: 295e348a5bb856a71716e1f2f68fa39f49173655 SHA-256: 21f075d7c3583dc857ed46b95c97c9d5f32442f50a28a3984f22c50c50103c48
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising "Roblox Hack Tool" and "free robux". The primary malicious link, http://netcdn.co/app/431946152/roblox-hack-tool-game-hack, is designed to lure users into clicking, likely leading to further malicious content or exploit attempts. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to deceive users.

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-hack-tool-game-hack In PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-link_GM406889139.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/robux-match_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/no-robux_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-com_GM406889139.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-game_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_off00004a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1F 28272 bytes
SHA-256: 9a8839c0853cebf50822702385dfa65f450f555ec51a60791e9d2a8c3f2cde4c
font_01_sfnt_off00008a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5B 18368 bytes
SHA-256: f7f9f10d8e5d1c79e7e1929b9b1f60b98842924afc005d3d19dd53bbc85ced3d

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