Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf8bf95348af3c6…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 21:57:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0108b3fa5f2d97d53c9a8a4763ed6ed3 SHA-1: 9ab2aea9de5bcb03640f9dbfdffe6e735c71b609 SHA-256: 7cf8bf95348af3c6a77c8148b277050d9b19f3b5c003505f43cd5987b48e83df
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically promoting a 'game hack' or 'free generator' lure. The primary URL identified, http://netcdn.tw/app/406889139/coin-master-key-free-spin-game-hack, is flagged as malicious. The document body also contains this URL and other links related to game exploits, reinforcing the phishing and redirection attempt.

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.tw/app/406889139/coin-master-key-free-spin-game-hack In PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/roblox-free-followers_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/is-nexusus-roblox-hack_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/free-robux-obby-download_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/hacked-accounts-in-roblox_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/roblox-shopping-simulator-hack_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/cheats-for-roblox-high-school_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/pink-paradigm-hack-created-by-lord-of-robux_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/800-robux-for-free-gamekit_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/pubg-uc-mtc_GM1330123889.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/coin-master-cheat-codes_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
font_00_sfnt_off00003205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3205 23100 bytes
SHA-256: 107c7966bba28202aca2f7cfda7d3c831b01210154b119d5c5f4c9869b2fe24c
font_01_sfnt_off000065e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E1 18352 bytes
SHA-256: 061150fbdeaed7229e7a1722ec377d93af9e08c005f541ea7c3088ba8c6e6598

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