Malicious PDF — malware analysis report

Static analysis result for SHA-256 0513e2c262085185…

MALICIOUS

PDF

37.3 KB Created: 2021-07-08 01:05:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8afef8d7baed756e3fa310a0331ad884 SHA-1: 164ddeb1d875153b6b0a1768f005a9481eaf2d1f SHA-256: 0513e2c262085185487b8df8615c22e858d1a6c87f8f8a25403dc9c958846288
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/406889139/free-coins-and-spins-coin-master-2021-game-hack.
  • 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.tw/app/406889139/free-coins-and-spins-coin-master-2021-game-hack PDF link annotation
    • http://proyetec.com.co/aym_image/files/how-to-make-a-free-ad-on-roblox_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/best-way-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/appbountynet-free-robux_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-rich-in-roblox-accounts-with-limiteds-dump-2021-working_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/hack-for-roblox-piano_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/roblox-hack-unknowncheats_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/booga-booga-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/how-to-make-an-item-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/911-whats-your-emergency-my-roblox-accout-got-hack_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-stuff-in-roblox-games_GM431946152.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_002_off000031a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A2 22352 bytes
SHA-256: 636a219b65be82c90828b34045d921f601391d0d1416f33dffb4f28885dd075c
font_01_sfnt_off0000635d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635D 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D42 18752 bytes
SHA-256: 2808497b37fc1d4f34a1fffc3dd5e81983cd3403e98677a9ba5497e95ebc42c8

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