Malicious PDF — malware analysis report

Static analysis result for SHA-256 81461e43e0a438d0…

MALICIOUS

PDF

34.3 KB Created: 2021-06-26 08:57:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3ff20b75ebd720424bb95bd7d86dfb5d SHA-1: 80f4286f8d677cce761c8b791d1ea860b2de35cc SHA-256: 81461e43e0a438d091eda990cccbc1efd0bbdb2b67ae65d6e252f5cf1376869f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links, identified as a 'link farm' by heuristics, that lure users with promises of free game currency and hacks. The primary URL, http://netcdn.co/app/431946152/free-robux-100-life-game-hack, and many others hosted on new-era.com.tw, are likely intended to lead to malicious websites or download further malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.co/app/431946152/free-robux-100-life-game-hack PDF link annotation
    • https://new-era.com.tw/image/data/files/roblox-counter-blox-cheats_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/robux-download_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-can-you-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/roblox-scam_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-robux-group_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-robux-no-verification-required_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_off00002d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D50 22996 bytes
SHA-256: 448facbcaa689bdf13fdcb82bbbb513a4ad3488b91d1060993c21dc9fd7821f3
font_01_sfnt_off000060be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BE 19112 bytes
SHA-256: c810363c5053b3f7d4f4b3c3a7cf8a0e0adc38b668855b75f443ac1d20504f5a

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