Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8b8b67d07b71cc…

MALICIOUS

PDF

35.8 KB Created: 2021-06-03 10:01:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0c7d503d76d14f445d91955255804ac9 SHA-1: 6d90600d49f0861ba2dc447e8a077ab82394f96b SHA-256: 4d8b8b67d07b71ccc0fa2c45a4b0413b48fd76e9deec9285f0debdda773b6188
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one disguised as a 'free generator / game hack' that redirects to malicious infrastructure. The ML classifier strongly indicates maliciousness, and the embedded URL is associated with known malicious redirectors. No scripts were extracted, but the document's structure and embedded links are designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • 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.
  • 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/479516143/minecraft-java-free-game-hack In PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/pokemon-go-no-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/is-tiktok-free-to-watch_GM835599320.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C0 26224 bytes
SHA-256: 49e7c05cb540b650cc59827dcf0d0f002a6b776511a895923116299018c2fdcb

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