Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a69e814c154922b…

MALICIOUS

PDF

36.2 KB Created: 2020-08-30 05:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 204cb0114945cb834e5647049ad1b0d9 SHA-1: 171186f95264f3e6ef78027b7bb36869b41f7bf8 SHA-256: 7a69e814c154922b491f824cdcb61fedfbc6e9856e94f3f6adc79bc03ddb7c67
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=thu%25C3%25AA+c%25C4%2583n+h%25E1%25BB%2599+trong+revere+ma, which is flagged as malicious. The document appears to be a link farm designed to lure users to potentially 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=thu%25C3%25AA+c%25C4%2583n+h%25E1%25BB%2599+trong+revere+ma
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_696f9caaa6974f939c5b3889be0ffbe5.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd79669ea32441c2a7b886e7b9b0e282.pdf
    • https://static.usrfiles.com/ugd/b8c837_1036b049c496476fa302a3d9a69dcf2a.pdf
    • https://static.usrfiles.com/ugd/097bd5_18a0681448904058b753dd758f986c6d.pdf
    • https://static.usrfiles.com/ugd/d43733_5b6b97253de945d39e9dcb932fd6a7f3.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/mokiwimuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/78292175762.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2454/files/sample_abstract_reasoning_test_with_answers.pdf
    • https://static.usrfiles.com/ugd/f4de5e_9aff6b87e6e8486787c582cb55a6f674.pdf
    • https://static.usrfiles.com/ugd/b8c837_827273defede44d1b6180b8bfe373ef4.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_off000045fb.bin
b8fe5f575123bf317a551fa4fd5b7469f4c6be3c6c8b078863a106261bc6cc04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45FB 5588 bytes
font_01_sfnt_off000057b9.bin
6d50c0990c82512a4f6910e1c93b2fcf6876d0aca4451ec4425a764e495358f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B9 20108 bytes

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