Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa3abb29397fdea…

MALICIOUS

PDF

42.3 KB Created: 2021-05-17 20:24:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0b155b54df712947607ca495926463d3 SHA-1: e212540973590fe4e327f315e292e33bf14a7ef5 SHA-256: bfa3abb29397fdea0e7941dbf25d6c98715bec3fddf9e6d6d743fdc6f750fca9
160 Risk Score

Malware Insights

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

The PDF contains links that redirect to malicious infrastructure, specifically promoting game hacks and cheats. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure reinforces the deceptive nature of the document. The embedded URLs likely lead to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/479516143/hack-client-game-hack In PDF document text
    • http://waldkindergarten-abensberg.de/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/rbx-free_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/get-robux-now_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-free-spin-and-coin-link-app_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_off00004aef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEF 25508 bytes
SHA-256: b83bf0c83aa56eb5d46972c4b909a42a411e17a6570e36139293f30eb0ed2f3b
font_01_sfnt_off00008475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8475 17812 bytes
SHA-256: af75091dd1ed9ff92a17a8bd9a3d097f77d0b86e0c60fbcf01e38630a3bb1c5f

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