Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87079df0c9fd769…

MALICIOUS

PDF

43.2 KB Created: 2021-05-12 16:01:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 121de21eecbba567b2bfb1e1e4f74177 SHA-1: 5f89e064cad35878ff2e46bbd099c0bbc9c94523 SHA-256: a87079df0c9fd769388f807138792a6ee958bbf56c719e24fed00405f697b5a4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links that redirect to malicious infrastructure, masquerading as game hacks and generators. The document body and heuristics indicate a lure for users to click these links, likely leading to further malware downloads or phishing attempts. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/479516143/minecraft-free-online-games-game-hack In PDF document text
    • https://reggieslockandkey.com/images/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/robux-sites_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-website-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/easy-robux-hack_GM431946152.pdfIn 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_off00004e68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E68 25328 bytes
SHA-256: fdfd9a149d43bce43f9940f126a1d19c390e82c9f74bfe66c7f95e0456ccd336
font_01_sfnt_off00008803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8803 17900 bytes
SHA-256: 4b77619cba729584a62e96e7fd69b59749ae88ba583596c01091ec51b146d7ca

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