Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d5e1471e369f49…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 09:50:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fb07870ce420f2ddb62f8bd82cb7a6fe SHA-1: 718a62edb4636f274d0cf8d44aa22bde60916410 SHA-256: c3d5e1471e369f49752a314972ad2e16aba37e39483b3192fcaeeb91cef5e0ff
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and currency to entice users. It contains a large number of external links, many pointing to other PDF files hosted on digilib.ulm.ac.id, suggesting a link farm or SEO manipulation tactic. The primary URL http://netcdn.tw/app/431946152/how-to-get-free-ninja-animation-roblox-game-hack is likely a redirector to malicious content or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/how-to-get-free-ninja-animation-roblox-game-hack PDF link annotation
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-deals_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-no-human-verification-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-do-you-get-free-robux-on-a-samsung_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/descargar-roblox-hack-version-2385-apk_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/unlimited-gameing-hacks-roblox-generator_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/pokemon-go-free-download-ios_GM1094591345.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-cards-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/cheat-codes-vhicule-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-no-survey-or-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-accounts-to-do-good-stuff_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/robux-fun-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-dragon-ball-z-roblox_GM431946152.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_off00003564.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3564 22980 bytes
SHA-256: a17aa79163ee8f0e6a736fcf16e42ceb760a72b85671c73d51973eb9cdeb84b6
font_01_sfnt_off000068d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D2 19300 bytes
SHA-256: b4baecdaa30a0d8d27d138390e00d3e43066aba1a4d3f1f43ff2f22dc44784a8

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