Malicious PDF — malware analysis report

Static analysis result for SHA-256 a494cc9da33ca584…

MALICIOUS

PDF

32.3 KB Created: 2021-07-05 20:20:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 76c3a1c39ab88bb058a8059531601697 SHA-1: 8b9afadbbba34d0d4b0054a75453d4942bf0c355 SHA-256: a494cc9da33ca58495bf3424e2c186af768f97156a5b6c56892d1e042d195e20
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with malicious redirectors and link farms. The primary lure appears to be 'game hacks' and 'cheats', directing users to a malicious redirector at http://netcdn.tw/app/479516143/hack-minecraft-game-hack. The document body also contains a large number of links to other PDFs, likely part of a link farm designed to improve SEO for malicious content. No scripts were extracted, but the overall pattern suggests a lure to download further malicious content or visit compromised sites.

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/hack-minecraft-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-speed-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-van-candy-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-my-girlfriend-cheated-on-me_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/pokemon-go-free-pokeballs-code_GM1094591345.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/tiktok-free-hearts-apk_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-lua-script-snow-board-resort-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/app-free-robux-google-play_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/cheat-pour-phantom-force-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/fashion-frenzy-game-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-exploit-free-no-viruses_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-generator-tool_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_off00002c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C5A 22036 bytes
SHA-256: 283f687c70b1fb65f82a7fe04c8e39ae78bf2b715ffee3ee40ee26fc9e0d3f02
font_01_sfnt_off00005c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C82 18024 bytes
SHA-256: dfd9b79a19cc1f195c001309102fb5aa6a063071b6395cd5a2b473f5f084aedf

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