Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f48fbd19c57511…

MALICIOUS

PDF

33.4 KB Created: 2021-07-04 14:20:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3fc307e66fa685ef0cafe2c26ff75ecb SHA-1: 4fa83bb6b853ab8bbc68f203d7ab7db22b8b10db SHA-256: 53f48fbd19c575116920a771a117f94f9c708fba3e3baa820607a2e018f2d0b1
182 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 LOLBin command-execution lure. 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 0.9980

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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-exe-game-hack PDF link annotation
    • http://library.stipjakarta.ac.id/etd/repository/bebe-rexha-i-got-you-cheat-codes-remix-roblox-id_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-pet-simulator-jump-hack_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/cmd-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-robux-admin-hack_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-roblox-vip-login_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/www-free-robux-club_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-snow-shoveling-simulator-free-santa-bag-inf_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/speed-run-4-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/hackear-el-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-a-free-t-shirt-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-redeem-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stiIn macro / runtime command snippet
    • 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_off00002f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F15 21744 bytes
SHA-256: 99ea5ab464dc12e49fa01bcc772a3ed7524c4991e9ed3b528ba272bf4a1411e3
font_01_sfnt_off00005e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E90 18716 bytes
SHA-256: d879526d17834eef7ec53fa1f2e94fc6027c3862d934ab81bb2be8c7d2c4e18b

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