Malicious PDF — malware analysis report

Static analysis result for SHA-256 047646e03bbf2d7d…

MALICIOUS

PDF

43.1 KB Created: 2021-05-16 04:07:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 51a6b6fac9d4d92e63261a0945081ff9 SHA-1: a313385017377df7420ddd65c36607fa25b487b9 SHA-256: 047646e03bbf2d7deb2607dd7d222fcb19e8db061cbee39f43ea26b15a1a9a9a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to external websites, including a known malicious redirector, masquerading as a 'game hack' download. The document body and embedded links strongly suggest a lure to trick users into visiting these sites, likely for further malware delivery or phishing. The presence of numerous PDF links also indicates a link farm SEO strategy, common in malicious document distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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/descargar-hack-coin-master-game-hack In PDF document text
    • http://nikabio.com/images/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://nikabio.com/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://nikabio.com/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://nikabio.com/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://nikabio.com/images/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://nikabio.com/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://nikabio.com/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://nikabio.com/images/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://nikabio.com/images/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://nikabio.com/images/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://nikabio.com/images/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_003_off00004c56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C56 25208 bytes
SHA-256: 74e043dabd269c9029cd679a50ab253ac84f3cd909a9e179bb9445273f00fb8a
font_01_sfnt_off00008689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8689 18172 bytes
SHA-256: 8e05f9f32595a35b5a9f3361bee3fb11860dee14ab597e5c6e5f24d8016f84fd

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