Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7cc9b64365f6df…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 19:06:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8e0616853fc5dbc9d396f6ed8137d929 SHA-1: 204d1b82240b8272dd0db9a01e1b5dc33aa54774 SHA-256: af7cc9b64365f6df391efdd69ac78e9f63a2855cac9c6ab8d18eb38b5b9fed11
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. It contains numerous links to redirectors and SEO link farms, including a primary malicious redirector at http://netcdn.tw/app/406889139/coin-master-claim-free-spins-game-hack. The document's structure and embedded links strongly suggest it is part of a phishing or scam campaign designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/406889139/coin-master-claim-free-spins-game-hack In PDF document text
    • http://pustaka1.unindra.id/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-inceptor-hack_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-roblox-bypass-audio-maker_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/cheats-used-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-tiktok-fans-quick-and-easy_GM835599320.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-fan-page_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_002_off00002d3c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D3C 22552 bytes
SHA-256: da463828abe5cecf83a9dcced70a6975d00cc4e59e044af4bc512cef3800eb51
font_01_sfnt_off00005f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F79 18508 bytes
SHA-256: 1abd1480299989abb1f48682f677ba61eec9d98677dd9594eb02aefabe69620b

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