Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b33c3ce49eb5f4…

MALICIOUS

PDF

41.9 KB Created: 2021-05-13 03:35:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 515f56c443f535a63e1d53baf863c490 SHA-1: 1df47471d8ea7878199b414baae3182e9ca8f11d SHA-256: 27b33c3ce49eb5f403b585afb307b7f5fb768c4f352cbda73ca18e4d6e7d656e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by an ML classifier and contains a large number of external links, many of which point to other PDF files hosted on the same domain. The document body and extracted URLs suggest a lure related to game cheats and free in-game currency, a common tactic for phishing or malware distribution. The presence of a PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host numerous malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-daily-free-spins-link-today-2021-game-hack PDF link annotation
    • http://karolinaherrera.com/images/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://karolinaherrera.com/images/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/roblox-executor-free_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://karolinaherrera.com/images/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/windows-10-minecraft-hacks_GM479516143.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_off000047c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C8 24216 bytes
SHA-256: ccb654cf53522849d4818f32bc297faee97a3a629e78b8439c7e0ff931605e1d
font_01_sfnt_off00007ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE4 19052 bytes
SHA-256: 51ec1fd699785aa8f843f12306ac352f9679003eb9b4544ea09afbac11be1d71

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