Malicious PDF — malware analysis report

Static analysis result for SHA-256 280243b93866bb8d…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 08:35:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 707c2e2c11c1c781b31a15582664a2c2 SHA-1: 20087bfacf661a5a7d3ee13ae0a112e63f5c66a5 SHA-256: 280243b93866bb8df5e91489178d265e2cbc60e027cb684316c76b1723d44d2d
220 Risk Score

Malware Insights

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

The PDF contains numerous links designed to lure users into clicking on game hack generators and free currency schemes, ultimately directing them to malicious redirectors and link farms. The ML classifier strongly indicated maliciousness, and the heuristics point to a deceptive SEO link farm strategy. While no scripts were extracted, the PDF structure itself facilitates the redirection, likely leading to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/how-to-hack-roblox-accounts-game-hack In PDF document text
    • http://suaedy-library.net/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/good-reasons-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/youtube-como-ser-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-admin-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-rules_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-get-a-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-robux-pastebin-2021-no-wait_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-speed-hack-code-2021_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/dominus-hat-for-free-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-roblox-accounts-2021-not-been-used_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/bux-gg-robux-free_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
font_00_sfnt_off0000317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317F 22952 bytes
SHA-256: ca33fecfa6e3e84fb67a11928deaf8b64bd5a4c85dc3fbe4e2963d5ce5053eea
font_01_sfnt_off00006512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 19064 bytes
SHA-256: 8c571bf80081aaa5c2be303b8c9fe18b31c5334a74c17f7b55d65649f5ee093a

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