Malicious PDF — malware analysis report

Static analysis result for SHA-256 537671c2be05bd80…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 13:25:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 970b5d659c976f63795a612fe0ad7546 SHA-1: 5157eee4b618546f71008001a09400283b78baad SHA-256: 537671c2be05bd809c35f30b6bfa0f03bdad3929248368bbdb30e5ecdb2eacab
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The document body, though heavily obfuscated, contains references to 'Robux No Survey' and a URL matching the malicious redirector. The embedded links likely lead to phishing or scam websites designed to steal user credentials or personal information.

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/431946152/robux-no-survey-game-hack In PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-100-spin_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_off00005177.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5177 25592 bytes
SHA-256: 00f338574fc0cd510f170f5209592487bd294b4964e2a59ce3b51e65fe402991
font_01_sfnt_off00008c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C86 18144 bytes
SHA-256: 51c7a9de4a3a273f6fa8ac7622f19aef511f410b3317fdbb853ddd1ab61a3972

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