Malicious PDF — malware analysis report

Static analysis result for SHA-256 e830bcac93d027a0…

MALICIOUS

PDF

34.4 KB Created: 2021-06-18 07:30:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e556e64fc41a20935ae28a5bde65abdf SHA-1: 26d0cfe5cac0edf532a705ff9fb146ae97a494a7 SHA-256: e830bcac93d027a058149cf1fef7f61eed111ff8b7860ced51ab24d747185e7f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing indicating it links to a malicious redirector disguised as a game hack generator. The document body and embedded URLs reinforce this, pointing to sites offering 'free Robux' or 'free spins' which are common lures for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-generator-no-human-verification-or-surveys-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/pubg-2021-uc_GM1330123889.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/where-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hack-a-game_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/robux-survey_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-coins-link-facebook_GM406889139.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_002_off0000307d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x307D 21828 bytes
SHA-256: 2652bfeba06226931a35849831e9abce70735661602e3e04494a8a3278071ae2
font_01_sfnt_off00006041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6041 19440 bytes
SHA-256: 74601277dc0f0246691c934fdd038c17d0211a0b849e41ae57dbe34f62fd7e36

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