Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9542180b36625e…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 08:40:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a0179f1bca4ad8edf36aeb3ab1f0e144 SHA-1: 35cb8868e9c516f49281cca85bc4edbb28ca6843 SHA-256: aa9542180b36625e7364220b6bda8e769711f89d7488abd4c368dbe677b7e47b
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as a 'game hack' or 'free spins' generator. The heuristic firings indicate that the document is designed to lure users into clicking these links, which likely leads to the download and execution of a second-stage payload. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/free-spins-and-coins-for-coin-master-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-unlimited-xp-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/demon-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/cheats-to-get-free-spins-on-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_off00004f34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F34 24212 bytes
SHA-256: 6916c062536e9442180b940e54a5fb915313960867c505067a9a1c5f0ba8945d
font_01_sfnt_off000086a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A1 2824 bytes
SHA-256: a0d6c1ef1f7405ab05245801e4abbc2877925f97898db53811df9ab010e978fa
font_02_sfnt_off0000903f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903F 18060 bytes
SHA-256: d4954d2d00bde9f6a1061857a61d2c62c1ae360f44744af150ee923481526d51

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