Malicious PDF — malware analysis report

Static analysis result for SHA-256 d791f92b4b1929cd…

MALICIOUS

PDF

49.3 KB Created: 2021-06-03 22:53:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3fd8fac9aa2ce716cc538f6bb19727c8 SHA-1: 84125dfa79d350b773bb847d200916da35acdc08 SHA-256: d791f92b4b1929cd946992360bc51ce77a696d85d15d7a56b2ec6ca7c8dd9e3e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to entice users. It contains numerous links to external PDF files and a primary malicious redirector at 'https://netcdn.online/app/431946152/free-robux-with-no-survey-game-hack'. The document's structure and embedded links suggest it is part of a phishing or scam campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/free-robux-with-no-survey-game-hack In PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/pokemon-go-free-play-online-without-downloading_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C8 25108 bytes
SHA-256: 6e1b2bd3e6006c5d9c61a90a1c97d11133ba2956546f9da2184ba55c3c5fc386
font_01_sfnt_off00008add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADD 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off00009c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C4D 18896 bytes
SHA-256: c9a06fd84da7c680e9235c6c693ba85d62e2f793adf65e6d39442d95d7fb6fc9

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