Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05e740ef3d654c8…

MALICIOUS

PDF

42.9 KB Created: 2021-05-14 00:40:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5c58ea1769480bd5da038a19e137ce87 SHA-1: 0f1c407aa6e15903f92be138dfeaa25550696cdd SHA-256: f05e740ef3d654c8aafb427acd13eeccddb88df6adc2e9fa1fa01f88ae134c93
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as a free game hack or generator. The embedded links, such as 'https://netcdn.xyz/app/431946152/javascript-free-robux-game-hack', are known to lead to malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF's nature and the presence of redirector links suggest an attempt to exploit users and potentially download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/javascript-free-robux-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-tools_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/games-to-get-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
stream_003_off000049e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E3 25136 bytes
SHA-256: 1adec512ab41040201ab88f2e27b3b20dcfc3141051e933935b85181fdd2f86f
font_01_sfnt_off00008380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8380 18920 bytes
SHA-256: 37df68cbe6d620a6a908579d98e7a1ce8a765682fff888c408a64c9cb805dd83

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