Malicious PDF — malware analysis report

Static analysis result for SHA-256 57df899f360a3b7c…

MALICIOUS

PDF

45.9 KB Created: 2020-08-29 04:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d93a7a689aba88e9dd175c4e65f9e96e SHA-1: 6f67ee3700d88396a4c8df5b7664062786c72e19 SHA-256: 57df899f360a3b7c419ae1903c56193a7d409c914fed489e1b409fd3dc4c9ca1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, many pointing to a redirector service. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ttraff.ru, which is known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm designed to distribute traffic to various destinations. The document body contains the URL https://ttraff.ru/wix?keyword=wayne+w+dyer+your+erroneous+zones, which is also listed as a suspicious IOC.

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=wayne+w+dyer+your+erroneous+zones
    • https://static.usrfiles.com/ugd/b8c837_8851dfdb54e04661ba2ea098443a24b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c71c59435294bb49a24a87059cfecf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d3e9abb2b6948a4a38ce6d4ba5f8abb.pdf
    • https://static.usrfiles.com/ugd/b8c837_e75fb7ffeecc407a85592424d02bffef.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/c_print.pdf
    • https://static.usrfiles.com/ugd/b8c837_753f2c1b5afd4c9c9d27b27cd23ea9ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e3589a9194b4ce88245409ee3968dff.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b932b11ed6492fad01f92eaefcb883.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c092c741a184fd3b44695179e4c95d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3789925a5934ba8865f20a61d036adb.pdf
    • https://cdn.shopify.com/s/files/1/0457/8816/8358/files/mathematics_of_personal_finance.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5176/files/42825591534.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/python_tutorial_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1111/files/16844386248.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/vampire_the_masquerade_rpg.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_off000076d6.bin
e5c0f264919fee5072d5e22de118b0471255ecad71b180adcae4d9d63166257b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D6 5044 bytes
font_01_sfnt_off00008829.bin
21cd49f5366b7fa64150e772064978efa7998809db7aa7d951dc8bbaa007818b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8829 10088 bytes

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