Malicious PDF — malware analysis report

Static analysis result for SHA-256 de717b287b06c147…

MALICIOUS

PDF

43.0 KB Created: 2021-05-10 20:38:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9e28b8ce030543c41dc42d7365a477c5 SHA-1: 66b03d80d96b50c3beff2c1d83dfc27b4d32d4fd SHA-256: de717b287b06c147227bc087a6bb533b8a55a54d7bb037ae2a2e90a83179a7ed
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as 'free Robux' generators or game hacks. It also presents a fake CAPTCHA, a common social engineering tactic to trick users into interacting with malicious content. While no scripts were explicitly extracted, the nature of the links and the lure suggests a potential for further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/how-to-get-free-robux-on-chromebook-game-hack In PDF document text
    • http://techmobil.pl/images/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-account_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/rbx-hut_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spins-app_GM406889139.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_off000048cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48CF 26712 bytes
SHA-256: e8e3a96633991d516798a8767becc9ffb6a24e7e70c329ed065d604178385944
font_01_sfnt_off0000844c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x844C 18880 bytes
SHA-256: cfbdee24d7402b99052158ce8ccd316620959aaec27a5d82eaae160d81e49f1b

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