Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1540b7c55536680…

MALICIOUS

PDF

49.9 KB Created: 2021-05-10 17:16:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1dbaa7d9ea6cd56902d681f88d01ad72 SHA-1: 501e622e7e8e425ee4b541d6cadaf51d1fbc924a SHA-256: d1540b7c5553668023e078710c81929ff928dd5acd4e3a8125e2de1777fd5541
260 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, including one identified as a malicious redirector, which is used to lure users into clicking on game hack or free generator lures. The document also displays a fake CAPTCHA, suggesting an attempt to trick users into executing further actions. While no scripts were directly extracted, the nature of the links and the fake CAPTCHA strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

Heuristics 6

  • 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.
  • 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.
  • 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-make-robux-on-roblox-game-hack In PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/my-robux_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/robux-hack_GM431946152.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
font_00_sfnt_off00004a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A86 25560 bytes
SHA-256: 4ae4fefa05d059c58eac76f41c9005a262b009ce1366d8607f8dfe70aea1ecd0
font_01_sfnt_off000085df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85DF 3964 bytes
SHA-256: f6b9a386ee4e0aff622a98b2230905da71eab0ca98398cb52018fda3528d3e2a
font_02_sfnt_off0000933c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x933C 3396 bytes
SHA-256: e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee
font_03_sfnt_off00009f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F2E 18680 bytes
SHA-256: 4ee66bb7c80a3238b98a264a09ad062de9bd506d82a8120fadf8a4fb1bc8e733