Malicious PDF — malware analysis report

Static analysis result for SHA-256 131ef853ac7a6237…

MALICIOUS

PDF

34.3 KB Created: 2021-06-19 03:32:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 594b35f4cc64c4f4f6e511fd7256312c SHA-1: a9e9034e77df97e512f81470acb4113797ba10f9 SHA-256: 131ef853ac7a62377d5db31c2f87a5d09ef066fbc115b2fa373151c81a9a0181
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising game hacks and free in-game currency for popular games like Roblox. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. The document body, though partially corrupted, contains references to these lures and the malicious URL. No scripts were extracted from this sample, but the embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content.

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/roblox-dance-your-blox-off-hack-game-hack In PDF document text
    • https://ibelive.com.tw/image/data/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-roblox-intros_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/websites-for-robux_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/how-to-get-games-that-cost-robux-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/roblox-re_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/cm-spins_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/boku-no-roblox-remastered-cheat-engine_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/blox-supply-free-robux_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_off000030f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F8 21756 bytes
SHA-256: c2ab68a08a9159cb1ac74b70a065326203e4b942cd9826d103b7bf5b08af59ad
font_01_sfnt_off000060b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B3 19124 bytes
SHA-256: e71952a64da7df822e6099c5c7b3fe5f58cfbd7c453367287c58e93443c8b9fd

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