Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3712a6f4fd4fb95…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 14:57:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: aad358e16e03f56c75289bdf7f657a2c SHA-1: 7d760b11e990c828514c074b9c76bea12666953b SHA-256: f3712a6f4fd4fb95eae7520f183ba8bf1855cf9ec2b78190b07c193a78fe6dd0
260 Risk Score

Malware Insights

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

This PDF document employs a lure of free game hacks and currency to entice users. It contains multiple links to a malicious redirector infrastructure, which in turn points to a large collection of SEO-optimized PDF files. The document also contains a heuristic indicating a lure to execute commands via the clipboard, suggesting an attempt to trick users into running malicious code. The primary goal appears to be driving traffic to malicious sites or potentially delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://netcdn.tw/app/431946152/cute-free-roblox-clothes-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-a-free-home-on-roblox-on-rocitixens_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-2021-generator_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-lumber-tycoon-2-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-mad-city-money-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/eternal-empire-roblox-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/pubg-uc-logo_GM1330123889.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-codes-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/is-it-possible-to-hack-coin-master_GM406889139.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
font_00_sfnt_off00002fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE1 21764 bytes
SHA-256: 145ed671a51ad0d38fc964fb074b7a8f2bb3283f33f3ae078ab716c56252c331
font_01_sfnt_off00005fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCE 19060 bytes
SHA-256: 7fe98571254095490b69240817b0f14cf24474a7a2b0a3d55eb74bfd47c91e32

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