Malicious PDF — malware analysis report

Static analysis result for SHA-256 857f3478e3b361ca…

MALICIOUS

PDF

42.9 KB Created: 2021-05-15 17:22:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3380c175b0a8fa044dea0e852728d07d SHA-1: da6346c8568f3fae142353c98bc1dc375beea63a SHA-256: 857f3478e3b361cad6c7223e45baa43da781904e7116d2578aefcf1f61811b3a
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, including a primary link to a 'free generator / game hack' site, and a large number of links to other PDF files hosted on dieter-sauter.com. The document also presents a fake CAPTCHA or human verification prompt to trick users into interacting with these links. The presence of these links and the deceptive prompt strongly suggests a phishing or scam attempt designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-earn-robux-on-roblox-game-hack In PDF document text
    • http://dieter-sauter.com/images/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/roblox-hax_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004843.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4843 25992 bytes
SHA-256: 86b14072e5f31ce7b77109c5d3bf6860f04a3cfc76b1a0b54445aae21c479f81
font_01_sfnt_off00008508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8508 18316 bytes
SHA-256: 648fa2b30230dc2606705c3a90d8924a9412c1d260df5319690c757a03f83928

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