Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4219a088954b0e9…

MALICIOUS

PDF

46.5 KB Created: 2021-06-04 00:51:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5aba54171b95fea1cd8361f621920eca SHA-1: 7588456af1e18d80915d65e070db38c24d3e94b8 SHA-256: b4219a088954b0e97be0e493968f3461e24e179b2923fa1a2c150c8f84fd0059
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9832

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 https://netcdn.online/app/431946152/free-robux-without-human-verification-2021-game-hack PDF link annotation
    • http://muslib.unmus.ac.id//repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/i-need-robux_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
stream_004_off0000500a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500A 28008 bytes
SHA-256: 83082cca86306a62361694d2b1ea803e342f60a8f9cb8cb91eed298e68ab8668
font_01_sfnt_off00008f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F23 19624 bytes
SHA-256: 5c907f8fc0171ac382cbe47737dfe307495a07ea2f2097b2a41ed37680731fb3

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