Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b71443ae2ddc3d…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 17:10:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fe906e12a4651ef28500c7081960b6b5 SHA-1: 313d884c1616e08f9ee5aea8db6f733f429d4e4d SHA-256: 83b71443ae2ddc3de31e67771c9cf15b6a3ea87c9200132aebaa930d61742647
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on "free generator" or "game hack" lures. The primary link directs to a known malicious redirector infrastructure, which likely leads to further malicious content or downloads. The document body and heuristics indicate a social engineering tactic to trick users into visiting these sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.
  • 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/coin-master-daily-free-spins-link-facebook-game-hack In PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/village-coin_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-roblox-game-card-generator_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-hacks-menu_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/tiktok-free-pizza_GM835599320.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-minecraft-games-for-kids_GM479516143.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
stream_002_off0000326d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x326D 23060 bytes
SHA-256: 305ce99a6e1ee2d2360477b02c6ad3658461f76d3956791275f14c66a9d32eae
font_01_sfnt_off00006656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6656 18924 bytes
SHA-256: a0d047bda18a8ecd9b1086251fa4bbdb0dcda0080a7233d126ecb60a43623744

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