Malicious PDF — malware analysis report

Static analysis result for SHA-256 73db61e239e2afc8…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 10:30:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d54b5c5b3194093b31b5d34b68ae179e SHA-1: 05578827278df90e4f0d5f8934c0fc761f5084e0 SHA-256: 73db61e239e2afc82d159f17de6496e702f3bfe9b7e3590cd72dd74afc84859b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a malicious domain, identified by heuristics as a known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'Coin Master Free Shield Link' and 'game hack', indicating a social engineering tactic to entice users to click the malicious links. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.online/app/406889139/coin-master-free-shield-link-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-magical-chest-coin-master_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_off0000518b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x518B 25472 bytes
SHA-256: 4faabcd2546d66cf4631ea0ddd0a87afee6a1d0f817933e561896ab1103b23f5
font_01_sfnt_off00008bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB9 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000095a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A3 18296 bytes
SHA-256: bdd75fbf8ec71bc04a66a4301b6f3f2701d1869f9351b389c8a652d8f5cf828f

Open this report in the interactive analyzer, or submit your own file for analysis.