Malicious PDF — malware analysis report

Static analysis result for SHA-256 68684efcfd74cb53…

MALICIOUS

PDF

45.5 KB Created: 2021-06-07 08:29:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 21fc4920f86872974d191a3e1ad422b0 SHA-1: 0e386b42ffc63bc95b359fca4c68a50781b27b5b SHA-256: 68684efcfd74cb53faa4300f7f312530ad2e9fa22ae9e080c9579954050121a5
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and extracted URLs suggest a lure related to game cheats and free in-game currency, aiming to trick users into downloading further malicious content. While no scripts were explicitly extracted, the nature of the links and the ML classification point towards a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.tw/app/431946152/how-to-use-cheat-engine-6.3-on-roblox-free-robux-game-hack In PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/roblox-free-radio-in-jailbreak-deutsch_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_off00005154.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5154 25748 bytes
SHA-256: fda3c534747548aaaf760d52dba8b326ce3bdad5f2ee21cf5481cfea9813f505
font_01_sfnt_off00008b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B06 19752 bytes
SHA-256: af788188bc3f680300c89ab5d2b06c1e2aea25143efe082ceef02e56c8df2144

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