Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a868f2e4657f2aa…

MALICIOUS

PDF

35.2 KB Created: 2021-07-08 06:29:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 302c0d61c27afe0cb89b699526922d1a SHA-1: 7be591bb3e59a5b195a52632dd83f2533d486e95 SHA-256: 0a868f2e4657f2aac4d97d02d22190483e76c88aa55fa72eb58240e00885aca8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/roblox-troll-hacks-game-hack. The document body and heuristics indicate a lure for game hacks and generators, likely to lead users to malicious websites or download further malware. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/roblox-troll-hacks-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/hacks-para-mad-city-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-roblox-admin-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/fros-digimon-v12-hack-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/gat-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/has-my-computer-been-hacked-playing-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-generator-for-robots_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hacking-roblox-thumbnail_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-darkness-2-cheats_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-use-cheat-engine-on-roblox-galaxy_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hack-atravesar-paredes_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-jailbreak-roblox-noclip_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hacks-mas-fuertes_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cool-free-minecraft-skins_GM479516143.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_off0000320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320A 22968 bytes
SHA-256: 169daf3c947fc343e320493b9e7c68a305ac09a6e338409ae7bd779e056db3ba
font_01_sfnt_off000065b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B2 18656 bytes
SHA-256: 506c9964a6ba50a89c40aafe23287f3dc449b704d64841aec82e0d7a1286d9c4

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