Malicious PDF — malware analysis report

Static analysis result for SHA-256 80aa8dd87cba0299…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 11:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8644f20a6cb2f0de9725d67850bf1f07 SHA-1: 1442c4d6d272b1c785838c024deae3f7044367d2 SHA-256: 80aa8dd87cba029931a443f442a0f8b474c82c300c3fa82095f0f325d7bf59b3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector URL identified as malicious. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for electronic device examples. The ML classifier strongly indicated maliciousness, supporting the presence of a link farm designed to redirect users to harmful content.

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=dispositivos+electronicos+ejemplos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b77b08_41fe08ae08644c7298397e36c6dc6ceb.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_d1ff41ffe61a485198e403462f65e15e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf72fc765e04470a8f2e65bb3ff3554b.pdf
    • https://static.usrfiles.com/ugd/912de2_dddf5ac349bc47349fbc99e337d73c7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6cc0c3695a347a68395060aaec38f3e.pdf
    • https://cdn.shopify.com/s/files/1/0432/1653/5720/files/23007818526.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1586/files/zufimuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0437/files/witozovadaserewoxuxivesij.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/1368222483.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc9f49499aad4e9d969b7b51fc7e39d7.pdf
    • https://static.usrfiles.com/ugd/299074_e03c2071bce742798ce8da96a022141f.pdf
    • https://static.usrfiles.com/ugd/b8c837_455f551428b740809a72f88b29ea7ddc.pdf
    • https://static.usrfiles.com/ugd/8b2c09_d8fd9d910f0a4576ad9a6d8339c2b97c.pdf
    • https://static.usrfiles.com/ugd/2ac701_1609a440b66f4c10bdd21019a3cd81ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_41cd3becc36648eb92556877ce68099e.pdf
    • https://static.usrfiles.com/ugd/0f1814_97aac2d74f0f42708622799593e5dd3e.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_f3d49b990e9e4bf086f86755d258c64c.pdf
    • https://static.usrfiles.com/ugd/bf650e_e613a311d1d64411939e6abea2767a90.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006861.bin
b877098d323c66913f4102e05ff00a7a7aacec703385d39f5d604e3748fb861d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6861 5004 bytes
font_01_sfnt_off0000795e.bin
190b9762d871335c5c1cf4fbdc1f5b63e81fe8b5d5fd35587b70921f3e98ee4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795E 11324 bytes

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