Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc510ad550a8898…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 19:06:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 92ecfa1c1c54895cfc4da0092d413f64 SHA-1: 09506a48221769be707f51dcb45a894b04635cd5 SHA-256: fdc510ad550a88983cb9e68102100659c30a271fb309ed87902fe8728a12168a
220 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 generators to trick users into clicking malicious links. The document contains numerous links to redirector domains and SEO link farms, such as 'http://netcdn.tw/app/479516143/free-minecraft-mods-for-pc-game-hack', which likely serve as entry points to further malicious content or malware downloads. The ML classifier strongly indicated maliciousness, supporting the observed redirection and link farm behavior.

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/479516143/free-minecraft-mods-for-pc-game-hack In PDF document text
    • http://oca.undil.tl/repository/roblox-one-piece-pirates-wrath-hacks_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-app_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/tiktok-free-folowers-free_GM835599320.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-place-rewards_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_off000030a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A1 22032 bytes
SHA-256: 652a6e466fa7f65fe9753a12590ded3d74086a4192ad3b0c0cee5bf5fdecc295
font_01_sfnt_off0000610a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610A 18324 bytes
SHA-256: ee1c19855408b16e2ffe5bd070dcc18f77e221a6cdc63e4ddeb47ffa0706d813

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