Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9caf5226470255a…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 18:12:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 724bf046747ff8523d1896d82a282dc7 SHA-1: 2915d48aa92afa073c853d74a56f7b0ece43c793 SHA-256: f9caf5226470255a6025a2f8eb261911bd8d07d756a1952d627d0047eb131675
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF gateways for game hacks and cheats. One critical heuristic identified links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/coin-master-hack-tool-without-verification-game-hack. The document body also contains this URL and other similar lures, indicating a phishing or scam attempt to redirect users to potentially malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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/406889139/coin-master-hack-tool-without-verification-game-hack In PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-hack-tiny-tanks-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-get-free-robux-2021-ios_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/robux-cheat-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/cheat-codes-for-roblox-2021-rocity_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-how-to-get-passes-for-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-weight-lifting-simulator-2-hack-script-download_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-weightlifter-cheat-codes-working_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-play-as-geust-for-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-catalog-hack-script-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/what-are-free-robux-codes_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
stream_002_off0000317d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x317D 23484 bytes
SHA-256: 1208580a12264428dded6029b874cfeb34fd1c99ff13a4ff27e4829182b94947
font_01_sfnt_off00006694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6694 18716 bytes
SHA-256: f8ec68208534efa05a94c1acc8c480e90cf0b4a7ffac5ddcfe84d51b49d5f46d

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