Malicious PDF — malware analysis report

Static analysis result for SHA-256 65863ee437db3958…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 05:07:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bf5d47c1d4033a235b26b13be9bdd66c SHA-1: c942e3ff05d9e70653deae5b24df825f5232824a SHA-256: 65863ee437db3958e48f3266dc21db9da8dedc772c9fc42ff9b302f25b2085a8
260 Risk Score

Malware Insights

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

This PDF file contains multiple links to known malicious redirectors and SEO link farms, disguised as 'free generator' or 'game hack' lures. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is presented to trick users into interacting with these links. The primary goal appears to be directing users to potentially malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.online/app/406889139/free-coins-coin-master-blog-game-hack In PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/mcpe-free-download_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/pubg-uc-kr-version_GM1330123889.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/roblox-cheat-for-infinite-oney-on-mining-simulator_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005204.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5204 25588 bytes
SHA-256: 3e17956e303b32618ef17372e63cc87af4e16c203e87650433dd2ec3bb28a967
font_01_sfnt_off00008c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C73 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000965e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x965E 18288 bytes
SHA-256: 525699ae71861fffeab431a07c950b4914d38a871fb98becad0e0bea9ac3f1df

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