Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb21ea5011fb131…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 18:25:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 57765d5786b6a215f765b2c84552ca86 SHA-1: 9e6da29228b52ff3ae2b356bb6fc5a15b3e87c2e SHA-256: 3cb21ea5011fb1315b68be70ca7f82146df89520aa8e8221ac9640bf888f4962
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free Robux or game hacks. The heuristic firings indicate that these links are part of a known malicious redirector chain. Although no scripts were explicitly extracted, the nature of the embedded links and the document's content suggest an attempt to drive users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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/rbl-gg-free-robux-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-golden-cards-hack_GM406889139.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_off00004dc2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DC2 24840 bytes
SHA-256: 50c1488a70ac1517eefaf0e0a8b1566f04e4b4424cd8b1323f37d81763eac2b0
font_01_sfnt_off000086ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AD 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off00009354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9354 18376 bytes
SHA-256: 36d8e5c8df31ce5774558eb4dff236d908794f1052653b7bf9d7a2310610d2b4

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