Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e736ef4cb64a788…

MALICIOUS

PDF

37.2 KB Created: 2020-08-28 21:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0d6c5b2ade107e59df99bd5329b0a10 SHA-1: d8dffe40bc45e9fa4568991a2619764af881d706 SHA-256: 6e736ef4cb64a788b7a2d303f7870a8023e74ff8edf9d787537cb16c29d26fb9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. This URL is presented within the document body, disguised as a scholarship recommendation letter, aiming to trick users into clicking it. The presence of a large number of external PDF links, many pointing to benign content, suggests a link farm SEO tactic to obscure the malicious redirector.

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=letter+of+recommendation+for+chevening+scholarship
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9367/8497/files/arduino_uno_projects_for_beginners_with_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1218/files/10984287244.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/dbt_house_activity_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/7474/7558/files/beveiligde_bewerken_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/selinasapedug.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/46478804047.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e6c73a0db134c0095ad4887dd126290.pdf
    • https://static.usrfiles.com/ugd/b8c837_1419705ab4874e0bac4a3c4176785338.pdf
    • https://static.usrfiles.com/ugd/b8c837_a869920c2be9433d96f3d89cfd14d061.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7b30d30360941fc9ee6229c55a5721d.pdf
    • https://static.usrfiles.com/ugd/b8c837_32b88497fe0d4453ae700cd695b252f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_32975b8428db4debb5f0b5f227053f85.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c4e3d1d74f947e1ae4d67666191a89f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d63e9179ec9c4057915a8716084d9ae0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f369167a16424859b507f67f9304f693.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_off000052c6.bin
5bf9035d8d9df6bc94aa1c1320ec4be938fd879fb147923eb9aea5423f910528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52C6 5572 bytes
font_01_sfnt_off00006598.bin
ed4ca32a352e931e77ad98b32d2f7dab740ff0f1d11cf66349a893fe774998cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6598 9964 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.