Malicious PDF — malware analysis report

Static analysis result for SHA-256 5322c823727dd8ee…

MALICIOUS

PDF

43.3 KB Created: 2021-05-15 06:20:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 107fb3ea4fda553d4ca8ca65eda72f40 SHA-1: 767bccee6e7d540b8dc86f00e6cf24ad4d450ee9 SHA-256: 5322c823727dd8ee0de1900628e82b45935e0bc68df40bda3f83f71cf8150934
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to SEO spam pages, likely designed to drive traffic or host malicious content. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a mechanism for redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-free-100-spin-link-game-hack PDF link annotation
    • http://mittlenberg.ch/images/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://mittlenberg.ch/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mittlenberg.ch/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://mittlenberg.ch/images/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://mittlenberg.ch/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mittlenberg.ch/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://mittlenberg.ch/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://mittlenberg.ch/images/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://mittlenberg.ch/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://mittlenberg.ch/images/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mittlenberg.ch/images/free-spin-coin-master-link-today_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_003_off000046d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46D7 27760 bytes
SHA-256: b502b5296eeba15bb675f53b466362f7e0dbeee9b208f5b13f9783854a2f739e
font_01_sfnt_off0000869e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869E 18336 bytes
SHA-256: 7e778ef079ae960c06ab48a136ea41e415783434fe93bdbecaa752c7fe43c00d

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