Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d704645d5420c7c…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 18:04:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fbd2a19a058050059eeb931337939846 SHA-1: 0813fd18b7bbd47c6858717bcf88cce3710be54e SHA-256: 6d704645d5420c7c5abbc066e9d0db702e2ff0317d092e529b9d4cd391d313cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to a malicious redirector. The document body text and extracted URLs suggest a lure for free in-game items, likely leading to a phishing or malware download site. The ML classifier also strongly indicated maliciousness.

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/406889139/free-spin-coin-master-2021-link-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-every-month_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/conseguir-robux-gratis-hack-inspeccionar_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/boku-no-roblox-hack-script-auto-farm_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/game-freak-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-free-gamepasse-script-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-admin-roblox-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/quelquun-hacker-mon-compte-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-robux-no-human-verification-2021_GM431946152.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_off00003170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3170 22180 bytes
SHA-256: 4a64d8689957e7261d0a840a21e5fb4ba020a26268cde0767e709866da9da892
font_01_sfnt_off000062d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D2 18748 bytes
SHA-256: 87551c50e6d609f3c8aae9c53aca7d1ad4c281dc834da60ceb94801aa8be48ba

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