Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdf010f1f4fe0c4…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 05:13:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e8a95bd2d0862bcd212bdb34dacd7cea SHA-1: d9113bd117bf38023bd96c80c3d7d15b62543408 SHA-256: 4cdf010f1f4fe0c4f9024ff4f7e8224605d1f9988bfe65d386003cf3a05da53c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/431946152/free-robux-generator-no-human-verification-game-hack PDF link annotation
    • http://sellitafrica.com/media/storage/editor/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-flee-the-facility-cheats_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/spped-hack-2021-november-for-roblox-the-last-avatar_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/code-for-free-red-jacket-roblox_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-roblox-account-with-robux-on-it_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-hack-any-roblox-account-with-inspect_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/best-free-roam-roblox-games_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/hilton-hotels-hack-roblox-vermilion_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-spins-and-coins-daily_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_off00003286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3286 22964 bytes
SHA-256: 2440af389afba6280d4b893b2adc1e8f5d6c8d119f1fcae286535730ff3c2a85
font_01_sfnt_off00006621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6621 19336 bytes
SHA-256: 1e7a5ee1c2d4ea33325644fd63b1f7e257f54daacec13fb4b037f0c912b7aa4c

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