Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2683349c57c13c2…

MALICIOUS

PDF

46.0 KB Created: 2021-05-16 13:35:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7417adf007556552b3dea2fb40ea8c5c SHA-1: 01524b821043515b2497b0179123412911914c85 SHA-256: f2683349c57c13c209947af2aef2835478dac6f9d7abec1620e21ecf916ab714
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free currency, identified as a lure for malicious redirection. The heuristic firings indicate the PDF is designed to redirect users to potentially harmful infrastructure. While no scripts were explicitly extracted, the nature of the links and the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/406889139/free-links-for-coin-master-game-hack In PDF document text
    • https://brainpads.com/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/hack-robux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/free-800-robux_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • https://brainpads.com/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEC 26872 bytes
SHA-256: f7388e4ec8c1a4fe7c2d16401e2a22a50183dfe11a116ee0aacc44437a61bc34
font_01_sfnt_off000085e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E0 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00009265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9265 17880 bytes
SHA-256: a04fca5b08559e76c7fc5751e50b7e5576d0693cd390b0db561ab022dd525d54