Malicious PDF — malware analysis report

Static analysis result for SHA-256 6289c19af3778027…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 18:07:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5a0a3f8ebeb21667619b8c4c265e7537 SHA-1: 0d76348a3d3bb3c250baf2e277489f79dcf5f0e0 SHA-256: 6289c19af37780279cafd7904dfaea6d7ee14d3399cdadebb6c8d46834bc0db5
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically advertising game hacks and generators, which is a common lure for malware distribution. The primary redirector URL is http://netcdn.tw/app/406889139/haktuts-coin-master-hack-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for exploitation or redirection to malicious content, likely leading to a second-stage download. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/haktuts-coin-master-hack-game-hack In PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/how-to-change-you-name-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/hack-roblox-robux-apk_GM431946152.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/how-to-hack-someones-passwordin-roblox_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/tiktok-free-pictures_GM835599320.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/how-to-change-your-username-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/free-roblox-toy-codes-2021_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_off0000329d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x329D 22984 bytes
SHA-256: 6a0ab977decf2c612a60093c54d20a0f7fb745bd70e4a51fb6048f5dcddb1b04
font_01_sfnt_off0000662b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x662B 18144 bytes
SHA-256: 7af4f5aa78d431c9967afade13530042deab11371d440c57f3259e725ceeac7b

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