Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b3047c2b3f0fcf…

MALICIOUS

PDF

48.3 KB Created: 2021-06-03 13:38:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b85958d3527964b845c5f3b01c5262d2 SHA-1: 56eb65e62a074c99aac68f012a2508370d4d8423 SHA-256: 91b3047c2b3f0fcf0fee816553c26d7ce4aaece6704dc096cbbf09269ba2537c
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to redirectors and SEO link farms, all promoting game hacks and free currency generators. The document displays a fake CAPTCHA to trick users into clicking these links, which likely leads to further malicious content or exploits. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • 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.
  • 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.online/app/406889139/how-do-i-get-free-spins-in-coin-master-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-game_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.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_off000052e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E7 26108 bytes
SHA-256: 92e3b47023706edf0d5ed06b7ed8c3cb5d9ce4e1098d9760c21793d0857f075b
font_01_sfnt_off00008ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFA 2944 bytes
SHA-256: a0301b7f2c576e4a889a11eed4f4f7770c47239120b218cd3fd1d2cb36c2aaf5
font_02_sfnt_off00009a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A23 18216 bytes
SHA-256: b027c2a021bab7014740c7b31d1151edd7292f7703eb7b510e8af7521ebdade3

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