Malicious PDF — malware analysis report

Static analysis result for SHA-256 42635b02af0edbf5…

MALICIOUS

PDF

42.5 KB Created: 2021-05-18 05:24:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9fc594222737c5ebe581ddcf1614df24 SHA-1: aab2474ad7ca221261ed2dd839bef6a7ff6a8019 SHA-256: 42635b02af0edbf5ac2df8c864759e6899159913a3cb86398e6df95e14d0661a
220 Risk Score

Malware Insights

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

The PDF contains numerous links designed to redirect users to external websites, masquerading as generators for game hacks or free currency. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-hack-tool-for-pc-game-hack, and a large number of other links point to the domain mountain.mn, which appears to host a link farm. These tactics are commonly used for phishing or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-hack-tool-for-pc-game-hack In PDF document text
    • http://mountain.mn/uploads/files/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://mountain.mn/uploads/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-no-anti-bot-verification_GM431946152.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_off00004788.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4788 30436 bytes
SHA-256: 1a05a0c2656077d35140593375e2d3eb361262d8c04a7dbb12c1f9bf76ece867
font_01_sfnt_off000084a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A7 18108 bytes
SHA-256: 41676337f8d66d7dfaadfd94b2675436d9ece3084dad9ad1b3cc1116d791989a

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