Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afb05e458b92c9f…

MALICIOUS

PDF

45.6 KB Created: 2021-05-11 08:30:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f075d64c779e48c74df5a8f6e46667c3 SHA-1: b11df128e56ffb98b7c421354dbf3b2692a50e23 SHA-256: 7afb05e458b92c9f0fee77baef3939ecbf70f9d27f6dd615e2512496a6f2d060
200 Risk Score

Malware Insights

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

The PDF document uses a fake CAPTCHA lure to entice users to click on a link. This link, 'https://netcdn.xyz/app/431946152/freerubux-game-hack', redirects to malicious infrastructure. The document's content and the presence of redirector links strongly suggest an attempt to lure users into executing further malicious content, likely through a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/431946152/freerubux-game-hack In PDF document text
    • https://kalendarite.eu/images/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-free-robux_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/roblox-redeem_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/games-that-give-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
font_00_sfnt_off00004787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4787 25900 bytes
SHA-256: c6d6b9a06e91262ee5415d1653a971d8bdc01e35c757cd511c89e5be141d4909
font_01_sfnt_off000083e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E7 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000090f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F9 17872 bytes
SHA-256: f4416bbc5f287efcbe31c7b4c704cc92a0ced0ddcdd2f5cfb5fb7d41fdf7fc1a

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