Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af5b404e40e0277…

MALICIOUS

PDF

47.7 KB Created: 2021-06-09 09:57:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2a83b7cd6e21f5256ce2682bac300940 SHA-1: 39b5f6a6bda0ad55d012922c2803f7407392a847 SHA-256: 3af5b404e40e02774a4fc4501cafdb25ab54f1356d7e211c3db3db8c2a9a2d26
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically targeting users interested in game hacks and generators. The document body, though partially corrupted, contains text related to 'Hack For Roblox' and a URL that aligns with the heuristic findings. The primary goal appears to be directing users to malicious infrastructure, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/hack-for-roblox-that-gives-more-money-jailbreak-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/master-game_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E2 24624 bytes
SHA-256: 0e9c91e64fc1fd1a557dc96075be8c9a440f1c57ae5eb56ead90739e40568c78
font_01_sfnt_off00008986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8986 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off000094b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B0 19392 bytes
SHA-256: 274d3f440b25890e943811691760dfd0372d597e925d5e58a78f94f88c644b81

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