Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c461faa9b7d429…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 13:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf5c46b3c774e3d6436ae01527cd2d91 SHA-1: fa8c8c042704d87396f6ded29b935307e3b89137 SHA-256: d5c461faa9b7d4292429b6c04c9d970f1f68f5b51122e80193f01db1d3e4bb95
152 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by a critical heuristic and an ML classifier. It contains a link farm with numerous external PDF links, a common technique for SEO poisoning or distributing malicious content. One of the primary links, 'https://ttraff.ru/wix?keyword=acquackanonk+village+haledon+nj', is flagged as a known malicious redirector, indicating a high likelihood of user redirection to harmful sites.

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=acquackanonk+village+haledon+nj
    • https://static.usrfiles.com/ugd/b8c837_910ca1f853d14bbd9914e32619b9fbc3.pdf
    • https://static.usrfiles.com/ugd/784815_1dfed95113fc486ab06ab08aca60132f.pdf
    • https://static.usrfiles.com/ugd/b8c837_abffd63dda0b4bf8ad2058abcf4aeb5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_de70664321e94bd5ae1b2183916fa764.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6192/files/napajabovepujulabo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4066/7808/files/jasper_report_table_footer.pdf
    • https://cdn.shopify.com/s/files/1/0462/3889/2192/files/alto_sax_sheet_music_amazing_grace.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9365/files/electronically_sign_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/3465/4358/files/editable_debit_card_template.pdf
    • https://static.usrfiles.com/ugd/43d598_a598e247ba6846e0897a736920c77ed1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0d9ea0f57004c04b51958ec8cf844ae.pdf
    • https://static.usrfiles.com/ugd/49be48_d11e0e4cd89143f0924bc829dd555c17.pdf
    • https://static.usrfiles.com/ugd/93c935_ecc7c57a4a624beea43259b44e4d2b27.pdf
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/mosolebiziv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/google_chrome_latest_version_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ae1.bin
a18167286f1d2155d29240d39506a6baabb528741ced695e3e4b4f8e6b773f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE1 5244 bytes
font_01_sfnt_off00005caf.bin
18e45955201a23b793f68c532234ba8da8578948380ea945102975416aacce78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAF 3020 bytes
font_02_sfnt_off00006937.bin
d20c74beda66734b18c40211a5b6893e1772aac1f4495e1dcb95efa7d50b789b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6937 14432 bytes

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