Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d032a2b81f055f7…

MALICIOUS

PDF

46.4 KB Created: 2021-05-12 03:36:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4d64d47e38fc5c7cd19be5659f5dd3b1 SHA-1: 264fed5676b9e07e0635f56f0e05b06e7e662c0c SHA-256: 3d032a2b81f055f70ae7852d1f0dda297f1ce7759ec6c7fb6ad23e1604d79c68
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on "free generator" or "game hack" content. These links redirect to known malicious infrastructure, specifically a redirector hosted on netcdn.xyz. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/406889139/coin-master-free-spins-apple-game-hack In PDF document text
    • http://ldjahorina.com/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://ldjahorina.com/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/how-to-get-robux-for-free-2021_GM431946152.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_003_off000048fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FC 28760 bytes
SHA-256: b6a71b715dc1926feb6f9f865f92d3f485228efc2ae1d44423e9199a51e63ef8
font_01_sfnt_off00008a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A30 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000093e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93E2 17960 bytes
SHA-256: b36d82a69cb85e4c678515c56ecb428cbe565fcb1c36aa2c67d2b595c698cd3f

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