Malicious PDF — malware analysis report

Static analysis result for SHA-256 4805b8f1a43d7cdc…

MALICIOUS

PDF

48.1 KB Created: 2021-06-10 14:33:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: df9991b744d3bdfd3a87b505d51be83c SHA-1: 589922354a9f5f21c92b0dd8a48e0d7f5e5418e8 SHA-256: 4805b8f1a43d7cdc97e0a4d41abe00bb55851e9998e3b2c0a211595206c91e32
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to websites that promise game hacks and free in-game currency, indicating a lure for users interested in such topics. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of these links are designed to attract search engine traffic. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/tower-defens-roblox-simulator-hack-game-hack PDF link annotation
    • http://zercalo.org/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/hack-game-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/is-tiktok-app-free_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-animations-ninja_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/como-hackear-cuentas-de-roblox-sin-necesidad-de-contrasea_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-hoverboard-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/pubg-uc-no-verification_GM1330123889.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_004_off00004fb5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB5 25912 bytes
SHA-256: f239091c4d7b2cbd36cc6af126f6b622bcdab1d0791916ecc69c03620d07783d
font_01_sfnt_off00008a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A20 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000096c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C7 19140 bytes
SHA-256: 1e5a713c957bb5b3d9d7307d1f8aba3740367f728d9ea113fb42aadd2cbacdf1

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