Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbaee656bb56fc4…

MALICIOUS

PDF

49.3 KB Created: 2020-08-29 11:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c692feab1ce3778a6dfb42eb864269d0 SHA-1: 2e579db55f19b44215e04d893ccc357b6be4fdbc SHA-256: fdbaee656bb56fc41f4025f2a14a6c87557518e1ba666e9a00a461c447324851
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, another critical heuristic indicates a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and a URL that appears to be part of the malicious infrastructure.

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.ru/wix?keyword=chien+de+l%2527enfer+mythologie
    • https://cdn.shopify.com/s/files/1/0433/7637/8014/files/jeratojepokim.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/how_to_check_if_gpu_is_faulty.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/witches_abroad.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/89260098253.pdf
    • https://cdn.shopify.com/s/files/1/0432/4750/1474/files/vewanezoted.pdf
    • https://static.usrfiles.com/ugd/b8c837_e90bf73675f04c30b8fc7ed03ca40738.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e67156b404d4e84b9a943e3778bc25e.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/44275584500.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/biodegradable_and_nonbiodegradable_waste_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/43905610002.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/8692150396.pdf
    • https://cdn.shopify.com/s/files/1/0452/6043/9713/files/articles_of_association_form.pdf
    • https://cdn.shopify.com/s/files/1/0460/8173/6868/files/64582814410.pdf
    • https://cdn.shopify.com/s/files/1/0434/8064/5782/files/13126714468.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/sutotosaladikuf.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_off00007d04.bin
ad406e1cbef826e88c20ae71732ccd2f852b8e47fc80caf0dc85d9561c880a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D04 4976 bytes
font_01_sfnt_off00008dd0.bin
20ba6189185bbe1cfa51540c93bfaee143c12a8bd755f2cbfc7a071bf23d1ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD0 12908 bytes