Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe57655dc52872d…

MALICIOUS

PDF

46.7 KB Created: 2021-06-11 00:57:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 683a23cdc05aebffe129e836ef1b001a SHA-1: 4e78c22713bbb099dcbe6f0019485ea31d546ea4 SHA-256: cbe57655dc52872d9b8838320a13735daa65de210b04e79dcc2bfaa8a2be7e29
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically targeting users interested in game hacks and free in-game items. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a download button lure suggests an attempt to drive users to external, potentially malicious, content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox-jailbreak-airdrop-hack-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-free-draw-pen_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-copyright-free-music_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-prison-life-btools-hack_GM431946152.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_off0000508f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x508F 28868 bytes
SHA-256: 1686950eb22128bdd97001a4fd134d3c0c8e5a9de9ddb00651d14665977d5914
font_01_sfnt_off0000926d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x926D 18820 bytes
SHA-256: 160bf0c2ad15017f8f426335eb5d039edb14428d1d6440d4e797298e77dd3760

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