Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb557ff17ce8255…

MALICIOUS

PDF

227.1 KB Created: 2021-07-05 22:40:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b967add81a7b32279eed9c48bcbb85ea SHA-1: 8237d9f0663272b372c4b6d96cde34907885757b SHA-256: 2bb557ff17ce8255e6ae054f9faccb49355532162cd33822606deee8d313e507
250 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, including a fake CAPTCHA and a lure for a 'free generator / game hack', to trick users into clicking embedded links. The primary link directs to a known malicious redirector infrastructure, indicating an attempt to deliver a malicious payload or lead the user to a phishing site. The document body and heuristics strongly suggest a social engineering attack aimed at user interaction and potential compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://netcdn.tw/app/1094591345/pokemon-go-free-username-game-hack In PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/mcpe-free-download_GM479516143.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-do-you-hack-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-play-bloxburg-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/secret-robux-hack-subscribe-to-make-it-works_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-without-human-verification-on-phone_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-roblox-intros_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-free-robux-2021-august-promocode-yt-hurry-2021202120210_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/blaze-games-co-free-robux_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-guest-666-t-shirts-free_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-studio-free-online_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-short-hair-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-bc-accounts-for-free_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_023_off0003210f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3210F 25576 bytes
SHA-256: f6fa2ac8aeaafa502bd9c2682e3fef14fb1695189c1e0b8c97de4e98da249bee
font_01_sfnt_off00035d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35D12 18544 bytes
SHA-256: 90c0c65e49d995bf1a559b4d0cb0e367d6407dfe0e8354cb0368b391b564de40

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