Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1aea1c63ee92dc…

MALICIOUS

PDF

643.1 KB Created: 2020-08-31 02:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf3c72ebdfdcd3f1f4924a19b9f0f5c SHA-1: b7c454d1bea57fa1d62af0efeae81b25c408fd65 SHA-256: 2d1aea1c63ee92dcc6a8865662a7d4b3306d959fa7cc4407b63e6217b1d0428c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users into clicking through to a malicious destination. The document body, though heavily obfuscated, contains the same URL. The ML classifier also flagged this PDF as malicious with a high score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9380

Heuristics 3

  • 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.
  • 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=keil+and+delitzsch+commentary+pdf
    • https://cdn.shopify.com/s/files/1/0438/1825/4498/files/college_admission_form_in_html.pdf
    • https://cdn.shopify.com/s/files/1/0431/8003/2160/files/fabekepuvikeselebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gamawogedeveredu.pdf
    • https://static.usrfiles.com/ugd/41a0b6_8a1dc32b5a37434bacc44f262a2a2c49.pdf
    • https://static.usrfiles.com/ugd/fbccce_1bad3ced37d94c24a3b3e1d0df9f510b.pdf
    • https://static.usrfiles.com/ugd/f0e51d_c86779a1111d49d1a3a644d98066b722.pdf
    • https://static.usrfiles.com/ugd/b8c837_1426225cefd9417493bf0331e6b88b03.pdf
    • https://static.usrfiles.com/ugd/b3bc21_043ca5c678ab4adebe748495be71ee29.pdf
    • https://static.usrfiles.com/ugd/bca722_b0ba0c42e14f46c5a09ea72280714cbf.pdf
    • https://static.usrfiles.com/ugd/b3bc21_8942a6674ade46208b0a903dc28220e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f1c2f6205f14e028ffd4927e95572bf.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0009a1ba.bin
701de18e869ba27c16d61f3cad385200fc71ee4cd195bff2b4a697779f69d15f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1BA 5516 bytes
font_01_sfnt_off0009b461.bin
a4baf352d476a073a2181b89d5e4e0cf3b2a6dc8ec59fbcfb30c45bb5a7c7080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B461 29240 bytes

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