Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd99f808f426f65…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 19:17:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7ee15b070b0eb361bc8996a87a2ab443 SHA-1: 5c2bb2a23f62e4faa974dd37cef031fe5ffa8c31 SHA-256: 9bd99f808f426f6542ddd12eaddc5ef9784c3b1b10f08f293c9e6b8219f5d6c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'free generator' and 'game hack' lures. The primary URL, http://netcdn.tw/app/431946152/can-you-earn-robux-game-hack, is identified as a malicious redirector. The document body and embedded URLs reinforce the theme of exploiting game-related promises to entice users into clicking malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/can-you-earn-robux-game-hack In PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/is-it-possible-to-get-banned-for-cheating-roblox_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-have-free-robux_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/roblox-script-hack-list_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-axe-roblox_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/gift-card-robux-free_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-get-free-followers-on-tiktok-without-human-verification_GM835599320.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/roblox-work-at-a-pizza-place-cheats-2021_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-download-nonsense-diamond-hack-roblox_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/roblox-free-clothes-in-catalog_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_off00003250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3250 22832 bytes
SHA-256: 1922c95e81aadda1fc4d817ddd8d1f50a263418aea0defe47c9648400eff8121
font_01_sfnt_off00006505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6505 18716 bytes
SHA-256: d39dacb9556eb96443c78b44790360b5af02b47934ec8ff5f00c4bccb246b27c

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