Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa01924143b9f6e7…

MALICIOUS

PDF

33.6 KB Created: 2021-07-05 17:44:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a37377ef1db5c35430e9d5374fe13323 SHA-1: 7ab8c719dd9d03082f35790719385c7e3ec55efd SHA-256: aa01924143b9f6e712efd8f79321907a613d57fa1dc7536faabd85458a29c30d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF documents related to game hacks and free in-game currency. The primary lure appears to be a 'free generator' for Minecraft, redirecting to 'netcdn.tw'. This suggests a campaign to drive traffic to potentially malicious or ad-heavy sites, possibly for monetization or further exploitation. No scripts were extracted, but the extensive link farm and lure tactics are indicative of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/is-there-a-free-version-of-minecraft-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb//repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/speck-elements-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/this-group-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-free-download-for-tablet_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-how-to-get-paid-games-for-free_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-bird-roblox-id_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pokemon-go-free-levels_GM1094591345.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/pubg-uc-vn_GM1330123889.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-spins-cheat-deutsch_GM406889139.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_off0000322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x322E 21452 bytes
SHA-256: 459da7e8662f557bfb776adae2e7c8355b241b1c75b4d438f4553da24aff7947
font_01_sfnt_off000060ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CA 18296 bytes
SHA-256: 555136c24bc0cc7b26cdfc0df6c1cd4857b7d13fa5348b764e09ccd429d35249

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