Malicious PDF — malware analysis report

Static analysis result for SHA-256 af93a55b1237fd31…

MALICIOUS

PDF

54.4 KB Created: 2021-05-13 08:13:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c87ece7aa2325aa7aca52b963c4c25fd SHA-1: 6a01b8caeb06dd368567c7acc530dc3c46faa039 SHA-256: af93a55b1237fd3184a2432127288beea769939c6da9149454c194cb4b72de8d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are disguised as game hack generators or free currency sources. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

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.xyz/app/406889139/moonactive-coin-master-hack-game-hack PDF link annotation
    • http://tehergumi.hu/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/village-coin_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/robux-boost_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://tehergumi.hu/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://tehergumi.hu/images/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://tehergumi.hu/images/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C8C 25280 bytes
SHA-256: 5c94ae20ea8737ec3c484ed3a55a54b69645fc94ec2678b41054ba3fff4eb614
font_01_sfnt_off00008702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8702 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off000091cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CD 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000a4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F3 17828 bytes
SHA-256: 3b77f8e569e4f3f6961f42008a117918c248a2cb25088fae7057e33a0a22bb09
font_04_sfnt_off0000c5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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