Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e71c487814e16c…

MALICIOUS

PDF

33.7 KB Created: 2021-07-20 06:46:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1a7f03e4599299c073cb82f25597693f SHA-1: 569af8d6a9bea50746c3aa742fc348ab2a06e19b SHA-256: b4e71c487814e16cb89ca991fc860ba4a8db25a2eccafe1b74f8f6ff2eac0ea0
160 Risk Score

Malware Insights

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

This PDF document employs a lure related to 'Coin Master Free Spins' and 'game hacks' to trick users into clicking a link. The primary link, http://netcdn.tw/app/406889139/coin-master-free-spins-link-today-game-hack, is identified as a malicious redirector. The document also contains numerous other links pointing to various game-related topics, likely as a distraction or to increase the chances of a click. No scripts were extracted, but the presence of a malicious redirector and the lure suggest an attempt to lead the user to a malicious site for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/coin-master-free-spins-link-today-game-hack In PDF document text
    • http://bolandergroup.com/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://bolandergroup.com/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://bolandergroup.com/images/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://bolandergroup.com/images/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://bolandergroup.com/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://bolandergroup.com/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-free-spins-link-2021_GM406889139.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_off00002cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD4 23292 bytes
SHA-256: 8430c338b0397444e2cdec77ee6f5b6c0b4216dbc382f9a4ab85db307befcd36
font_01_sfnt_off00006164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6164 18412 bytes
SHA-256: ee277532c3187caf3da016130e4cbd3fee848ac0b1174d0f40fc16c12ed3c41d

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