Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a3d6f3f7251d87…

MALICIOUS

PDF

44.0 KB Created: 2021-06-04 03:07:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bad98600c61b71ff7b2f718da5dd9149 SHA-1: dd9fea16bfe6a9a73a53d8dc17aace59054ae84e SHA-256: 56a3d6f3f7251d870a2c2911d9a91ca9e4c2745ac308f8ac327c125dbb4bf476
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 0.9865

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/get-me-robux-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/is-pubg-uc-hack-possible_GM1330123889.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/rbx-com_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_off00004e72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E72 25864 bytes
SHA-256: aa8e1b79ebfc604edd9f96e6f678c9083b08eef891fa7030f35e4b1f77d1fbeb
font_01_sfnt_off000089c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C6 18152 bytes
SHA-256: a45e33870dcdfec4be2d188e583d66387a562064ddf1ebe544b9a56fe2c1f10f

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