Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2b42fa374f369f…

MALICIOUS

PDF

45.0 KB Created: 2021-06-10 16:44:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 76f98d5829e35ad7109644618298041c SHA-1: af49ac6e82cf102daf7abffef4eda7a237d5959f SHA-256: 8a2b42fa374f369fedaf38e01118b94ee66db7a10c2b3cc30224216ec56ebe0c
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, including a prominent one disguised as a game hack generator. The document also displays a fake CAPTCHA, likely to trick users into interacting further. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest a phishing or scam attempt, potentially leading to further malicious downloads or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-items-for-kids-on-roblox-game-hack In PDF document text
    • http://lib.untad.ac.id//repository/pokemon-go-free-accounts-2021_GM1094591345.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-cs-go-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/synapse-x-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/mc-hacks_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-2021-hack_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
stream_004_off0000521d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521D 24972 bytes
SHA-256: eea3ddc9ab8a818ad91f99c70846cefb6e2500e912cf95717751ac96eef5abcd
font_01_sfnt_off00008c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C37 18604 bytes
SHA-256: f17760e748fd43f725d672f2bbc3ba455fb51386d9a7619226a1dd769fd9ed51

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