Malicious PDF — malware analysis report

Static analysis result for SHA-256 61facc5e5b71e49c…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 05:13:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 98a9fff0a8a392ec9005f7f1e63381b6 SHA-1: 8e7cc5451c66f4ea117e424d7def46e3aa8333d0 SHA-256: 61facc5e5b71e49c4722ac2a561bb90d3efec47ba713d263c0b3f9f5eca5bc90
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-no-generator-game-hack. This indicates a phishing or scam attempt designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of malicious links and the lure content strongly suggest a phishing or social engineering attack.

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/431946152/free-robux-no-generator-game-hack In PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-free-no-hack_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/alt-tab-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/free-ash-greninja-shirt-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/pokemon-go-free-bag-upgrade_GM1094591345.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/youtube-have-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/free-bypass-songs-roblox_GM431946152.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins_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_off00003036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3036 22180 bytes
SHA-256: 21da2bf878c4f9e0d2c53f4dc70ec29ab10934f2947929875327048eaa58f7e1
font_01_sfnt_off00006173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6173 18820 bytes
SHA-256: 261ea0d489a423ac242e977cf9c2ebb558fc055835ac2ff71b731d45313ea59b

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