Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a37aa795c4bf8b…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 15:04:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2b573ec27ef2185e31c4929272cef53d SHA-1: 6abd82464557f29339a1173152059598b2d653d5 SHA-256: d9a37aa795c4bf8b4169424c4e534b7d1af7c812a261af7cc3479fdf7cf35de1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to game hacks and free outfits, directing users to a known malicious redirector. The embedded URL http://netcdn.tw/app/431946152/how-to-get-free-outfits-on-roblox-game-hack is identified as malicious infrastructure. The document body and numerous extracted URLs reinforce the theme of exploiting popular games for in-game currency or items, a common social engineering tactic.

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/how-to-get-free-outfits-on-roblox-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-november-2021_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-aesthetic-clothes-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/hack-person-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/pokemon-go-free-clothes_GM1094591345.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-crystal-redeem-code-star-wars-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/but-link-says-free-robux-walter_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-random-roblox-accounts-without-anything_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-coins_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_off0000312d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312D 22240 bytes
SHA-256: 59297cf6ad2b64f0f487a8ea82a8a9e77a596a4a236b0b1e1b154c98466ec93e
font_01_sfnt_off0000626e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626E 19180 bytes
SHA-256: ed497d95b734e9c9731d536326a9a55fd67885f196b0c7961c12ebe128b4a934