Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbeb2aa6eeb2251…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 03:57:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3c60c469514e17dd713586f004688288 SHA-1: 14c4b5b5554d6c7435e921f86132f152245b2ab9 SHA-256: ffbeb2aa6eeb22516d6245713c238e6507a12339c5a4327562f944ce391e09a3
220 Risk Score

Malware Insights

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

This PDF document contains multiple links to redirectors, masquerading as game hacks and generators, which is a common lure for phishing or malware distribution. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm designed to attract traffic. No scripts were extracted, but the document's structure and embedded links point towards a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-download-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/is-pokemon-go-free-to-download_GM1094591345.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-for-coin-master-game_GM406889139.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_004_off000050d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D6 24824 bytes
SHA-256: 209a43e5b71eba03605100bdbff4671abb21fd5cf76c1cdedfa3b397ec5e0abe
font_01_sfnt_off00008954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8954 18124 bytes
SHA-256: 5249e296d4e98cbf63458d60065d08f788638b222f85d6c58d160e1a36990528

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