Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3edb1c45121edc…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 21:58:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 55f8be87fb1af34c2eb855238dba3b80 SHA-1: 8e2b4748826376a3c7b93c97c5cebe3402057993 SHA-256: ab3edb1c45121edcea786957e09725da8d9d633d4301097073bfabe4315cdb01
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to scam websites, specifically targeting users interested in game hacks and free currency for games like Roblox and Coin Master. The ML classifier and specific heuristics for malicious redirectors strongly indicate a malicious intent to deceive users into visiting these scam sites. No scripts were extracted, but the document's structure and embedded links are designed to trick users into clicking through to malicious or scam-related content.

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-scams-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-bleach-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-interview-center_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-codes-to-hacke_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/cheat-engine-682-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/pick-a-side-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-pizza-tycoon-money-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/robloc-robux-cheat_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-music-cheat-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-no-app-download_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spin-link-coin-master_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_off00002f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2D 22596 bytes
SHA-256: 415748536bdb8ee076f30f64d99682752ed4eef67e7652a17c480c423ba910f0
font_01_sfnt_off0000617c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 18976 bytes
SHA-256: 48eef6298bef607355aca425a8072928fe0e0a0bc0ee660e64f251d9c93ff6b2

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