Malicious PDF — malware analysis report

Static analysis result for SHA-256 304d5c92d49e6e47…

MALICIOUS

PDF

51.4 KB Created: 2021-05-15 23:32:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 647d710337ef03489f74a8f193299045 SHA-1: 40ef0edafb0d764a7e989728e5b78562f79616f5 SHA-256: 304d5c92d49e6e47446e148536f392e05859189b4208e0d4945e6f5a56a2a84b
240 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and impersonates Microsoft to trick users into clicking a link, which leads to a known malicious redirector. The document's content and heuristics strongly suggest a phishing or scam attempt designed to lead the user to a malicious site. No scripts were extracted, but the embedded links are the primary vector for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8646

Heuristics 6

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-roblox-clothes-templates-game-hack.
  • 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.xyz/app/431946152/free-roblox-clothes-templates-game-hack In PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-robux-script_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ee7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE7 25116 bytes
SHA-256: 3151d724919e0b0ef634992e0a09138bef2de6d26129a51cbbbf3884594b1791
font_01_sfnt_off00008962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8962 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off0000931f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x931F 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_03_sfnt_off0000a490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA490 18884 bytes
SHA-256: 640c63db932491e4e87d0cbe8bcafce8540653682ab1762ebca962469be3fa30

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