Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a906b390154c62…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 08:02:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8c1e9c82b12143e3e764700499287ab6 SHA-1: b6305e0bbdc87d4d4f71794be75c3dc4392d60ea SHA-256: 15a906b390154c6254e8bcaa1921192b8ff36e3bc4b118bf5e94c890d22dac03
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector domains, masquerading as game hacks or free generators. It also presents a fake CAPTCHA to trick users into executing further actions, likely to download and run a second-stage payload. No scripts were extracted, but the embedded URLs and the lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • 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.tw/app/431946152/free-robux-codes-july-2021-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/what-tiktok-free-views-without-verification_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-look-like-dio-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hacks-para-el-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/cheats-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-do-you-get-free-roblox-money_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_004_off000052b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B6 26748 bytes
SHA-256: 337c6d890d04a6c70bbc1482382951d2d2b4bd326314baa4770ebdb2cace847c
font_01_sfnt_off00008f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F03 19012 bytes
SHA-256: dd1acef48d5543a813c08bfca130339585619d35a260127ec045ea38f5754477

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