Malicious PDF — malware analysis report

Static analysis result for SHA-256 06282360fb4a25d4…

MALICIOUS

PDF

52.2 KB Created: 2020-08-30 10:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87411e55a262ab79fcb992a5c6756949 SHA-1: 80033cc26a95cf5726ce97c1feb5a0f536aa264a SHA-256: 06282360fb4a25d481145956eb3399cbe5acbda0b93d78184824548a44e834ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=hercules+juego+pc+tipos+de+juegos'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 'https://static.usrfiles.com/ugd/865d50_69df5ec22ac34befbaa4357e27597d4d.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.cc/wix?keyword=hercules+juego+pc+tipos+de+juegos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/865d50_69df5ec22ac34befbaa4357e27597d4d.pdf
    • https://static.usrfiles.com/ugd/5360f8_1ec9eb811d084c01989f4e1a30d86b7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7dec993685842a59996048e02d31b77.pdf
    • https://static.usrfiles.com/ugd/d54300_9eb377934882401fade19fcf9cc3d4ae.pdf
    • https://cdn.shopify.com/s/files/1/0463/2517/0331/files/guided_meditation_inner_peace_sleep.pdf
    • https://cdn.shopify.com/s/files/1/0433/2886/4409/files/todafimomovajovutu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/aaos_cervical_spine_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/pizijadedugovi.pdf
    • https://static.usrfiles.com/ugd/7f46b5_eb3825fc53e04c9c9f5446381949f31f.pdf
    • https://static.usrfiles.com/ugd/b8c837_898694c2f8824a628fe9f7a932fa1b0e.pdf
    • https://static.usrfiles.com/ugd/ea78e0_7b2a6931adef4881bdf815083bc71abc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0045a5acf644ecd8e81c7dd61163492.pdf
    • https://static.usrfiles.com/ugd/a107db_4b0c3ad169834a448e74e3fb5840cc3d.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/610228142.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/lagu_hanya_rindu_versi_inggris.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a3d4.bin
f28afb06a2edce60f1a01a28a68c72b5dbe77d0d32cc60915d23d6c84b301f24		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA3D4 19084 bytes
font_00_sfnt_off00006d53.bin
e6cb053124c7ae3635a0a7eb1d6bc77c5c1b302a009328e6d4e69d34d34977c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D53 5068 bytes
font_01_sfnt_off00007ea5.bin
f1f86c47b3bb100d85e627caae6f87a62058c56aed496012b963bb249754f4d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA5 11416 bytes

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