Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a241a2892768aeb…

MALICIOUS

PDF

41.7 KB Created: 2021-05-11 03:30:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ec32116a39666b7f08941ff4967b1765 SHA-1: 775622bdbfe58fc0e0a5fec806282b839e514019 SHA-256: 3a241a2892768aeb01c1435b91537efe38b8131c132dba2abbd120ad050f25eb
160 Risk Score

Malware Insights

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

The PDF contains links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Coin Master and Roblox. The document body, though partially corrupted, contains references to these lures and directs users to URLs such as https://netcdn.xyz/app/406889139/coin-master-cards-free-cards-game-hack. This indicates a social engineering attack aimed at tricking users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-cards-free-cards-game-hack In PDF document text
    • https://www.taline.hr/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/roblox-account-taker_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • https://www.taline.hr/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/coin-and-spin_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • https://www.taline.hr/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://www.taline.hr/files/coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/getrobux-ninja_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_003_off0000493c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x493C 25256 bytes
SHA-256: 220511f242dc841010dfc0f4b816b7999c241041acbc08c5f6964b8d2b80d75f
font_01_sfnt_off000081c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C7 17884 bytes
SHA-256: d54aa51eaaaa3e2864f0114713409e316145a0183ee6aba9be1e443db1dceb19

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