Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b95c12cb01fd87…

MALICIOUS

PDF

50.5 KB Created: 2021-05-19 09:06:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f4ecbb05298508227fdb4176497c09a SHA-1: 21b47a87d07c898a779d745a111ccec907267c61 SHA-256: 04b95c12cb01fd87960ba33727b6eb97491eda120e0dddfbf5d1e165aea28eb9
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 0.8594

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/431946152/free-roblox-injector-game-hack PDF link annotation
    • http://asandawireless.co.za/images/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://asandawireless.co.za/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://asandawireless.co.za/images/roblox-website-robux_GM431946152.pdfIn PDF document text
    • http://asandawireless.co.za/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/mcpe-116_GM479516143.pdfIn PDF document text
    • http://asandawireless.co.za/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://asandawireless.co.za/images/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://asandawireless.co.za/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a74.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A74 27972 bytes
SHA-256: a749e2e57fe5db38496d0163994cb1dd5853f69d61cf96150e6f4cdceebbc625
font_01_sfnt_off00008a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A61 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off000095fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95FE 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA30F 18240 bytes
SHA-256: 982f5c9c7a17738cdf254efb30c47e94aaf5f1193221314be64a44066d2d2c00

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