Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead8a0b9757f1e18…

MALICIOUS

PDF

49.8 KB Created: 2021-06-08 21:05:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fbac936d23535b228bb63741999e7c19 SHA-1: 2fef76920a4debf8b3484d966ad6979b4037aa9e SHA-256: ead8a0b9757f1e184aa82b11bc03af2f8f3d61df63910bcccd81169d8e353111
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure related to game hacks and redirects to malicious infrastructure. The ML classifier also flagged this PDF as malicious. The embedded URL leads to a known malicious redirector, which in turn hosts other PDF files, suggesting a chain of malicious documents designed to trick users into downloading further malware or engaging in scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/who-hacked-roblox-to-change-the-thumbnails-of-games-game-hack In PDF document text
    • https://kierowcyhgv.uk/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://kierowcyhgv.uk/images/how-to-get-free-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-java-edition-download-free_GM479516143.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_off00005356.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5356 25680 bytes
SHA-256: b0c5641bc62ee408389c198a4d7515defe4897b0d3f768a114102018fca8f979
font_01_sfnt_off00008f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2F 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off00009c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C56 19528 bytes
SHA-256: 88c49c7d8b0e5f14a331837d39fcbeb6c1d969c4926bb0cdb569e6a79e6ff91e

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