Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a86fa65bde022fc…

MALICIOUS

PDF

33.6 KB Created: 2021-07-09 15:35:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b86afc85f16311cd3ed89a2d77c5e73e SHA-1: e3845aa85166e7c3e86139c9c917d1d2ad20a180 SHA-256: 6a86fa65bde022fcda9dc21cabe30585a8d7a58cd2b1467a4551303ec7ee0267
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector, disguised as a lure for game hacks and generators. The ML classifier also flagged this PDF as malicious. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting malicious sites, likely to download further malware or engage in credential harvesting.

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-draw-roblox-game-hack In PDF document text
    • https://dentmate.com.tw/image/data/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/getrobux-now_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-gift-card-ins-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/hack-roblox-account-kali_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/dantdm-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/hack-exploit-roblox-download_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-roblox-toy-code-march-3rd-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-free-robux-hack-no-password_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-secret-free-items_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/robux-generator_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-re_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-for-kids_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
font_00_sfnt_off00002d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D90 22044 bytes
SHA-256: 227301d22670bd01db8595e61d93da00ae76837483072761d821af5803b4c347
font_01_sfnt_off00005e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E48 18984 bytes
SHA-256: c9a437ed21f5727825c8f5bb4a2a9a84ae98f08afb2ff34fcd41a5b5e7b26fbd

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