Malicious PDF — malware analysis report

Static analysis result for SHA-256 843e1ca2bff419ae…

MALICIOUS

PDF

44.5 KB Created: 2021-06-07 06:15:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2e8ce55be626432a3f2b584fe88b8642 SHA-1: 3963208f7dff117556e6bf8a95136d276e18183a SHA-256: 843e1ca2bff419aecb12a5dcee625d8a93a6e58b5bb282ac69fc7f02ae92ce0c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that are flagged as malicious redirectors, specifically leading to 'game hack' lures. The document body, though heavily obfuscated, contains references to these lures and the authoring application suggests it was generated programmatically. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/shirt-roblox-template-free-shipping-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/pokemon-go-free-qwilfish_GM1094591345.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/microsoft-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/robux-money_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/follower-bot-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-minecraft-for-kids_GM479516143.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_off00004d94.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D94 25356 bytes
SHA-256: b6423cc14358873b7f2306bf3e41f66e31f1de2bda5d8b7e3a557e57dfa73ae9
font_01_sfnt_off00008865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8865 19292 bytes
SHA-256: f0692480d0c0abc85086548b625fa47b7483cd8dc36176461377f282ccf227f1

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