Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4935db678970d19…

MALICIOUS

PDF

49.7 KB Created: 2021-05-12 14:37:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a284477ca21a12b0aa1b2b0310b0bbb3 SHA-1: 0e52e692b683206705f82532a72b191cd042e20d SHA-256: d4935db678970d19831d3e583ea1a2103191e3b2ffee824280e151a66632a6a7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a call-to-action phrase, strongly suggesting a lure for users to download a payload. The ML classifier also flagged this PDF as malicious. The primary URL, https://netcdn.xyz/app/431946152/robux-free-2021-game-hack, is likely the destination for the malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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/robux-free-2021-game-hack In PDF document text
    • http://www.barkas-n-i.gr/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D3 26044 bytes
SHA-256: 666851f73e2cbd833a80df2b579fd21bf2e970ded4e321983236b97b643ab2f8
font_01_sfnt_off0000872c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872C 7420 bytes
SHA-256: 0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24
font_02_sfnt_off00009f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9C 18416 bytes
SHA-256: 1a644f5289783458eb76ac5741ebd0afe9ba6d8f40911ca8ddb4573f3c6c1b2f