Malicious PDF — malware analysis report

Static analysis result for SHA-256 76932079be24764a…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 18:03:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fc925b7708c02b6d041a4861b03e56eb SHA-1: cfba20179de5af8c09b18af859638591c7d2150d SHA-256: 76932079be24764a00905199164a97a1bd0ac7aacdb3b59c932b1303d08690d0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are presented as 'game hacks' or 'free currency generators' for popular games like Roblox and Coin Master. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicates a lure for users to click these links. The presence of a 'download button' heuristic further suggests an attempt to trick users into downloading potentially malicious payloads from these external sites. While no scripts were directly extracted, the overall structure and content point to a phishing or scam campaign.

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.tw/app/431946152/rewards-robux-game-hack PDF link annotation
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-paying-real-money_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robuxs-works_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/code-cheat-card-roblox_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-often-pubg-uc-paid_GM1330123889.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-a-free-gamepass-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/everything-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-sexually_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F42 22352 bytes
SHA-256: 8a71df2617df34077bd9e360858d1c5258117fc249ed5603e23d91f1e34f6751
font_01_sfnt_off00006133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6133 18888 bytes
SHA-256: 13d7bc9f49b8b591f3713cbd9cb1632c430be663ac63cdfbfdb50d830d5ed704

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