Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5954a46d9365f82…

MALICIOUS

PDF

45.0 KB Created: 2021-05-12 19:37:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cd41da4fc442c88f4b48e8cf7ba987a9 SHA-1: 83e892b65ee2f3f191e452ef79360f3da583d378 SHA-256: b5954a46d9365f824975bc72fec0aad33c9127fca3352727d5028494e698a3ac
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9632

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-get-free-coins-in-coin-master-game-game-hack PDF link annotation
    • http://www.sovtigaz.ru/f/files/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-coins-and-spins-coin-master_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
stream_003_off00004895.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4895 25480 bytes
SHA-256: 14a677eca3483e1bfd8c7e046750105fc130f3e2bf0b589c9aab44ae83d68f80
font_01_sfnt_off000082e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E6 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E10 18136 bytes
SHA-256: c27ce28ced2cd6ab43782601ea0ea90fe7d4241e5cbb0f725251c39d19020edf

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