Malicious PDF — malware analysis report

Static analysis result for SHA-256 1261a9903ae8e0cd…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 16:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2848140449b5ea86232d039e58cea3c0 SHA-1: 52145418ec751bfaa024b18fd96b5a499fca106d SHA-256: 1261a9903ae8e0cd151bcd37e4f52c81720349b71568792335da57dc5cb493ef
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'neonatal resuscitation course test answers'. The primary malicious URL identified is ttraff.com, which is flagged as a known malicious redirector. The presence of numerous links suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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.com/wix?keyword=neonatal+resuscitation+course+test+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_fafeba85272149c8a146bdad6c8026ef.pdf
    • https://static.usrfiles.com/ugd/77941b_52bfd1f86df64fb79604f01751762367.pdf
    • https://static.usrfiles.com/ugd/bb13a2_454d464c95654a1e8ccc0b46ae77af97.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_368b06d940954f8099999c122528968f.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_f1b5275081ca4b4791f6303d8cca36b1.pdf
    • https://static.usrfiles.com/ugd/a18aa6_9ff31fd094bc4d37a855affc1d2c5b27.pdf
    • https://static.usrfiles.com/ugd/865d50_ae422fe3818a4746a9031038db467b8b.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/nuxidotudel.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/allahabad_state_university_admit_card_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/76137435544.pdf
    • https://cdn.shopify.com/s/files/1/0440/1112/6942/files/26600286872.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/maduvatujotubo.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e529965e6e147beb781697430368693.pdf
    • https://static.usrfiles.com/ugd/409ca8_a3ab4f76055345ceaa5d0e85bc6254cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f9a4365e1224fc896f2ac8074c61f03.pdf
    • https://static.usrfiles.com/ugd/3aee12_4ebdf40c2c14455e980d8292de740521.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f66.bin
e1715e156b5b3e381174d6aaaaf92ae2f0ca6a1a968d86bba5bb5a74e07ed848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F66 4736 bytes
font_01_sfnt_off00005f97.bin
a0dcc934c6fd2df8400e53324b300160ff4072efb9cff87a9506834a7bb74a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F97 10300 bytes
font_02_sfnt_off00008284.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8284 4324 bytes

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