Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6522a5dd3df7857…

MALICIOUS

PDF

47.1 KB Created: 2021-06-04 02:59:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 002d4c8d811aecf8951953f9147f8d73 SHA-1: ced2199efd073762c09050c4211cfb4533839674 SHA-256: a6522a5dd3df7857262e6e9a1ed604272fd9c730412fe1a8f2514d3569d6e453
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free Robux to entice users. It contains multiple embedded URLs, with one identified as a malicious redirector leading to 'https://netcdn.online/app/431946152/websites-to-get-free-robux-game-hack'. The presence of a visual download button and the ML classifier's high confidence score further support its malicious nature. No scripts were extracted, but the document's structure and embedded links indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • 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.
  • 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/websites-to-get-free-robux-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/pokemon-go-free-12-km-eggs_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cool-free-halloween-costumes-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-system_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DC 24240 bytes
SHA-256: 8e8e86415fc7b06c54b2c6cb823a48688d085a729474b3c34629424f942f9579
font_01_sfnt_off00008826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8826 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off000094ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94CE 18436 bytes
SHA-256: 6ab9ab31980840835fbaeca164a74f0e8188db39a6ce5c5e4face3e95ba0b523

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