Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcf927a9557e474…

MALICIOUS

PDF

42.6 KB Created: 2021-05-14 07:16:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: de2f0ae1f3e3d83c95fe47031061837a SHA-1: 9582e6f6b448b297900c1e211f2da805fcdf8d77 SHA-256: 0fcf927a9557e474ef2acf2e4ce5668afee62c8010017af1dfddb2edebce5cbc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to malicious infrastructure, specifically targeting users with lures related to game hacks and free generators. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links confirms a malicious workflow. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for further exploitation or phishing.

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/roblox-free-hair-codes-game-hack In PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/roblox-account-taker_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/sites-for-free-spins-for-coin-master_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_003_off00004740.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4740 26476 bytes
SHA-256: efe1fa32f7e81d3525cfadb3c3354ea84b30249652a7539b93747e5ff7676002
font_01_sfnt_off00008379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8379 18472 bytes
SHA-256: 0c34ab104977070915151016e24e35187f8354093682c5401cbbc3770fde4f5e

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