Malicious PDF — malware analysis report

Static analysis result for SHA-256 c235f84384ff2bac…

MALICIOUS

PDF

44.3 KB Created: 2021-05-11 08:13:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2162c526d8ca93a7e3dca4869dc256f7 SHA-1: a666612044b31bddf4eec4f3e841c177ad7b25d1 SHA-256: c235f84384ff2bacda103e49e1e07308a87c2b0755ced9edbac10731201a9ddb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, with one specifically identified as a malicious redirector leading to a 'game hack' lure. The ML classifier also flagged the document as malicious. The presence of embedded URLs and the nature of the lures suggest an attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/coin-master-blogspot-game-hack In PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/spin-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-for-coin-masters_GM406889139.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_off0000483b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x483B 24880 bytes
SHA-256: 806c730097c3aa7d3bdedab12c472b8b35051dc125fddd9adc19be21791a4230
font_01_sfnt_off00008094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8094 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A46 18300 bytes
SHA-256: 856755575c1a7459373c524fcaf021c967fba3d5c4d4b4c6d782a1862ea9e167

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