Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb13f362b90998f…

MALICIOUS

PDF

44.4 KB Created: 2021-06-07 20:34:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 504b587f85c942cccce3ba455ee2686d SHA-1: 7ee7738342cba52ea16dbc8d636a3d1c42f36ac8 SHA-256: cbb13f362b90998f10ab00a6d3e50c51edcabb8489ba252faa748eadb18ef1a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. These links likely lead to further malicious content or phishing pages. The ML classifier also flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-roblox-exploits-loadstring-game-hack In PDF document text
    • http://www.art-concept.gr/images/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.art-concept.gr/images/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://art-concept.gr/images/colossus-legends-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.art-concept.gr/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://art-concept.gr/images/free-apps-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/real-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.art-concept.gr/images/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.art-concept.gr/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://art-concept.gr/images/how-to-hack-some-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://art-concept.gr/images/roblox-prison-life-free_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.art-concept.gr/images/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.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_004_off00004fb5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB5 24888 bytes
SHA-256: 8500dab8b4f1117ab6b3148ec8950b18adf6229a9c57b9d6d67bbf6d80a671d2
font_01_sfnt_off00008882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8882 19036 bytes
SHA-256: 049d6a9ef5a3e2cf5bc1de4f718228670d291e465bf0ac2c581e45cb47701a62

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