Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a63c8b6ed1ee78…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 11:27:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5aeea632619b7dc593a2d59603fa9a84 SHA-1: 0c2a0dd1bb9a20550342d19d20ec8a8fb06ccceb SHA-256: 04a63c8b6ed1ee78c9af078eef112eeae3386ebd308282a68b68016283d18eb0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically promoting game hacks and free accounts. The document body, though heavily obfuscated, contains references to 'Coin Master Game Free Download' and a URL that aligns with the malicious findings. The presence of these lures and malicious links strongly suggests a phishing or credential harvesting attempt.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/406889139/coin-master-game-free-download-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/rblx-city-free-robux_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_off000051b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B9 24180 bytes
SHA-256: c812a5bb90cef9a1f5a0a1f6d99c3c563c891ebef7e75ca91bec76df930d57bb
font_01_sfnt_off000088e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88E0 18548 bytes
SHA-256: a0a0c8e1d18cb0b2c4d70870d3dfc55de425b9372d4c2a3baebf4bcbef941d80

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