Malicious PDF — malware analysis report

Static analysis result for SHA-256 138a6bdb118e5322…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 17:44:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7a0fe26688897559882241819d56dedf SHA-1: 32001613359891d833f11893094f8185d20a8178 SHA-256: 138a6bdb118e53227e9972b289300556ea91d4b5a8e5713dfe15eee9c760d646
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, masquerading as free game hacks and generators. It directs users to a known malicious redirector infrastructure at http://netcdn.tw/app/479516143/how-to-get-minecraft-for-free-game-hack. The document also hosts a large number of SEO-optimized PDF links, likely to inflate search engine rankings for malicious content. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/how-to-get-minecraft-for-free-game-hack In PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-secret-cheat-codes-for-music-its-raining-tacos_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-hacker-arrested_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hacks-exploit-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-hack-roblox-admin-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-codes-get-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/claim-gg-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/code-de-cheat-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/byfanatics-co-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-promo-codes-2021-june_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/good-roblox-avatars-for-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-free-no-sign-up-no-download_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/number-glitch-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/get-free-robux-if-you-finsh-ths-obby_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/adscend-media-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hack-comment-avoire-des-objets-gratuits-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-giveaway-xyz_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
font_00_sfnt_off00002fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA8 22884 bytes
SHA-256: 4b332b7e66878a4a6f2eb14ef5a8e6407c826c4416436bdd465c38b8369d779a
font_01_sfnt_off000062af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AF 18164 bytes
SHA-256: 38b14255ac27b6861525ff1bdc726797405021bf36bbc514593b3ffe59b08c64

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