Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac90dd11650c2be9…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 12:23:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3016a29fb0b5c25954da976348da6c9b SHA-1: c2aef43657f79534099f9665d711a35e80fc5f3d SHA-256: ac90dd11650c2be9817bc3086059b93feed41b980706fed470d1ad6848d7268b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious redirector. The document body and embedded URLs reinforce this by advertising 'free Robux' and similar game-related cheats, aiming to trick users into visiting the malicious link. The presence of embedded URLs and the nature of the lure suggest an attempt to deliver a secondary payload or phish for credentials.

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/free-robux-without-offers-game-hack In PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/robux-hack-that-saves_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/how-to-download-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-recorses-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/pubg-uc-and_GM1330123889.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/cm-spin-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_off0000313b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313B 21960 bytes
SHA-256: 4c8ce6363e01cdde33a7428affdbbe0b18c6e118bc5c09775e216e27a2d7fc07
font_01_sfnt_off000061b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B7 19304 bytes
SHA-256: d28279064c80375efd82c55b38a8139998c8ec291e9a82c1a232f0005e70f64e

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