Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d9d0a4fc07f742…

MALICIOUS

PDF

47.4 KB Created: 2021-06-11 09:55:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 21941dac686458c6bae3ecbd9e984ce8 SHA-1: 4477ac9490f5ca1c88827c90de1a2d32bc1fa03e SHA-256: 99d9d0a4fc07f74266d93aa5824429bb50d1eac140a76068a8c96a34f875dea0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirector infrastructure, specifically targeting users interested in game hacks and generators. The document body and extracted URLs suggest a lure for free Robux or other game-related cheats, which is a common tactic for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and malicious links indicate an attempt to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/how-to-get-free-robux-cheat-engine-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/collect-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hacked-shirts-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/daily-free-spin-coin-master-link_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_004_off000055d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55D5 26928 bytes
SHA-256: 9b5f49d909b5e335897f35818e50918195c3a31c5507652753f48dd4aeff9b21
font_01_sfnt_off000094b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B1 19084 bytes
SHA-256: 3ab96b50437f909ecac3f2adbc849bf3fc074c98c49560e06098afe633b74bbf

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