Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad54c44ede93062e…

MALICIOUS

PDF

41.8 KB Created: 2021-05-14 07:34:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5d5cf55a99c54e4735815f0454947a84 SHA-1: 0ea92593f3277743911fef82062ff04bbc485a1b SHA-256: ad54c44ede93062e420059d7191431bd3bf59c8115632fb2503a10fa52dc0352
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links and a call-to-action phrase, directing users to a known malicious redirector. The primary lure appears to be related to 'free Robux' or game hacks, a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-robux-please-game-hack In PDF document text
    • http://arhi-z.ru/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://arhi-z.ru/images/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://arhi-z.ru/images/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://arhi-z.ru/images/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://arhi-z.ru/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://arhi-z.ru/images/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://arhi-z.ru/images/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://arhi-z.ru/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://arhi-z.ru/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/robux-come_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/robux-generators-that-actually-work_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_003_off00004771.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4771 24948 bytes
SHA-256: 7c0e1ac2e47cbb9fbd3353dee2d48c751415b8d67d618c515f0e43083c1f5c16
font_01_sfnt_off0000805e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805E 18472 bytes
SHA-256: a4143b220e35e332e52efa777ecf598d1a164c1d6c5ab1887881bf2674d2e637

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