Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d1efa3ac3c1a38…

MALICIOUS

PDF

42.1 KB Created: 2021-05-17 19:15:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d61ba90b8d8849f9d2417ea10fe38ea5 SHA-1: d03445cfe4b837b1b0291c675fbe1a485be8c99d SHA-256: 83d1efa3ac3c1a3864d7c7e58514641ee9ebcd49c49300c3a363552dfccb81b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and domains, disguised as game hacks and free currency generators. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a phishing or malware distribution attempt. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

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/give-me-robux-now-game-hack In PDF document text
    • http://huounaixunghe.com/images/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/robux-now_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48B8 24912 bytes
SHA-256: 68d724bfe75c21a4f25eb754f872ba7f6cf501b5d7d5c184fab33bb108395b59
font_01_sfnt_off0000819e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819E 18444 bytes
SHA-256: da387504e4ee90144f6399ec13e2f6eb5be90933d390e8f78ca10c807e4b036a

Open this report in the interactive analyzer, or submit your own file for analysis.