Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb1213e07f1d7bf…

MALICIOUS

PDF

45.6 KB Created: 2021-05-15 17:40:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1037b5a94851c86e9d50bd122e341c6f SHA-1: 3af4a3fca6646aa76d9160778ab50ded7e071bad SHA-256: 8fb1213e07f1d7bf779fd62342f8c79aa48b7951bc30cfb6d7b04d326c5220e0
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 0.9507

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/coin-master-unlimited-spin-hack-mod-apk-game-hack PDF link annotation
    • http://pesok-rk.ru/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-coin-app_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-place_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/hack-coin-master-no-survey_GM406889139.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
font_00_sfnt_off00004a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A93 25716 bytes
SHA-256: 56a38950f36db1ee6a1bf0c15e77e872ee98acc30d3f5baf7ebead62e6e445a2
font_01_sfnt_off0000831c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831C 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00008f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F04 18584 bytes
SHA-256: 1f0ff171152404fee35ded77e01b9724573d4b9224166749f75d1c5d7d8d4db8

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