Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc47a5cad60c37fc…

MALICIOUS

PDF

46.6 KB Created: 2021-06-07 06:20:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d2f3dc4b6dbdd10de0018fd8e7bef5c SHA-1: 0060818f286fb2604a3bcea5ed72662aa6954133 SHA-256: bc47a5cad60c37fc7d950385a2f7da95cbf5f83ed630a811f9670e2c67f4756c
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 0.9832

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.tw/app/431946152/roblox-god-mod-hack-game-hack PDF link annotation
    • http://aviaprofsoyuz.info/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/robux-hack-free-robux_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_004_off0000502b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x502B 29360 bytes
SHA-256: f07c7fadc84c7cfe486e474ed3b504ddc5fdd0866d723e890e7bc67e082e1b8d
font_01_sfnt_off000092f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F3 18552 bytes
SHA-256: 2c1f607b0b5a263e6dce1e51952d0c47ba63d63dbd7b5dca0c8a42e864a1517b

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