Malicious PDF — malware analysis report

Static analysis result for SHA-256 de41d88856730c5e…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 05:53:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e20dc271517e082cdcc696884fc508b7 SHA-1: e87776bd93689b45c241bea84f17d91c173f282b SHA-256: de41d88856730c5eb4f85a13cf8e4fe75fc101ff728227a04042425ac649aa35
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them by promising free game currency or hacks. The primary link, http://netcdn.tw/app/431946152/how-to-get-free-robux-as-a-kid-game-hack, is identified as malicious redirector infrastructure. The document body and heuristics indicate a social engineering tactic to drive traffic to potentially malicious sites.

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-robux-as-a-kid-game-hack In PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/youtube-pastebin-robux-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/roblox-how-to-create-a-group-for-free_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/hacked-skybox-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/comment-hacker-un-server-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/roblox-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/roblox-free-pants-girl_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/how-much-pokemon-go-free-account_GM1094591345.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/free-dress-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/hack-roblox-prison-life-francais_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/comment-hacker-roblox-infinite-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/roblox-pastebin-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/roblox-free-item-codes-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/copyright-free-roblox-template-shirts_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/lila-plays-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/beyon-roblox-tries-hack_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_off0000323e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323E 22660 bytes
SHA-256: 356cb69eafdda5d6aa197c778862d2384a540ec495d6f62f0ca1ac927d56b347
font_01_sfnt_off000064cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64CC 19280 bytes
SHA-256: fbd482d3b42c402f31899b7174a93de7a7aa833796ffa593885741fefeb30eca

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