Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e238cca13693bc…

MALICIOUS

PDF

42.8 KB Created: 2021-05-16 21:32:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 97c6ff35af681a8cc530064feddcaaa9 SHA-1: 58ca18f0251fb5d5a1b85fd6bde37591515cdf78 SHA-256: 43e238cca13693bc4de17438d521d71aabbd2823c14f9b225be4e0304fc3e980
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/ways-to-get-robux-game-hack PDF link annotation
    • http://geometraperiotto.it/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-roblox-toys_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
stream_003_off000047f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F7 26108 bytes
SHA-256: 7ec9575bbc7a74441af7e376cee2c2a3be6ace78028d5554ac55eb7d8b6ffa22
font_01_sfnt_off000083e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E2 18560 bytes
SHA-256: 78441860773be54e7672751e0535bd0e3101a748f368cdf4dff6de317c2bf851

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