Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e37a679e833a82…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 08:44:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6928ede0492baa03f45b584da5c48129 SHA-1: bc5a0f33258618bc6e1a60ab37e9ead800b2a167 SHA-256: 63e37a679e833a82114dba99200e81549ed53fde80b6a280cd807a0560c10264
200 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt to trick users into clicking a malicious link. This link, disguised as a game hack generator, leads to a known malicious redirector. The document's content and heuristics strongly suggest a phishing or social engineering attack aimed at tricking users into downloading or executing further malicious content.

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.online/app/431946152/hacks-for-roblox-jailbreak-game-hack In PDF document text
    • http://digilib-unirow.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/rape-simulator_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/robux-link_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-not-fake_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
stream_004_off00005166.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5166 25524 bytes
SHA-256: a7288a94242af08bcdf957b124398d3e3992854c7abbb9169727c8af07091f85
font_01_sfnt_off00008c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C93 18632 bytes
SHA-256: 0c6da94061aa06f3897ec4e3cf893835e909886797588b4f947a24dee870a8ce

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