Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b38200d6bb3b7b…

MALICIOUS

PDF

34.7 KB Created: 2021-06-27 01:13:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 27a8f4dee75ef2f1db0434b42a47211e SHA-1: 2769cd84257fa8a15ca8d8e4998cda19d3e76721 SHA-256: 77b38200d6bb3b7b2ee93cd3247b69d956ffe71cc4fed74edaf55b047d024878
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector, that promise free game hacks and currency. The primary lure URL is http://netcdn.co/app/431946152/free-no-verificaton-robux-cards-game-hack, which is likely intended to lead users to a phishing or malware download site. The ML classifier also strongly indicated maliciousness.

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-no-verificaton-robux-cards-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/game-toolbox_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-tiktok-coins-2021_GM835599320.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-prison-life-hack_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
font_00_sfnt_off00002f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8F 22568 bytes
SHA-256: 0c6a25f4d423fdce474122c696501717afc33ab678101be3d52b60292f8a9bcd
font_01_sfnt_off00006202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6202 19248 bytes
SHA-256: 1f2bddf633991d939c6b2324e51e970da1b2a8ec5106fee97056c4c028f3b1f4

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