Malicious PDF — malware analysis report

Static analysis result for SHA-256 af30c2b61435a866…

MALICIOUS

PDF

59.0 KB Created: 2020-09-12 02:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 114245ca2a5ffa34957983c4db34bda8 SHA-1: 6359e16aed2a1301331cb1a93e56b91927c6f7de SHA-256: af30c2b61435a866a7b6d750029d79e06e175aa40f4dd83c2a40ef4136912517
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of the URL 'https://ttraff.link/wix?keyword=sound+attenuator+pdf' within the document body and the PDF structure suggests a phishing or redirection attempt to a malicious site.

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.link/wix?keyword=sound+attenuator+pdf
    • http://files.fmbcyubacity.com/uploads/1/3/1/4/131454549/bujakujuwove.pdf
    • http://mekilam.jremarart.com/uploads/1/3/0/8/130814855/fuxulujufomixol-kafenogubuma-mobumunufo-tejumiru.pdf
    • http://files.squarecatvinylshop.com/uploads/1/3/0/8/130813146/xosixofazi.pdf
    • https://static.usrfiles.com/ugd/90d19e_e39d8cfd32f146f5b9630ece3eb74092.pdf
    • https://static.usrfiles.com/ugd/b7ab08_5fbb347b41b341b9adff1dcfad0d7fe9.pdf
    • https://static.usrfiles.com/ugd/47e66e_1fafe2e70dc54003b80986d8652df619.pdf
    • https://static.usrfiles.com/ugd/3ed902_8f764d92ff5e4adcbe3a595f2aee7369.pdf
    • https://static.usrfiles.com/ugd/10b11f_1fce3f5e5fe54f3fbe8c07fd6caf1496.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/74342159371.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1251/files/90147602523.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/discord_isn_t_picking_up_my_mic.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/49539182234.pdf
    • https://static.usrfiles.com/ugd/8e6e76_002b2bc61c874097a19b24b77908d73f.pdf
    • https://static.usrfiles.com/ugd/23b571_54b7b918687f4e3796943357c2d6ad60.pdf
    • https://static.usrfiles.com/ugd/3e87bf_347eb48b200c4586b5c547518e985d89.pdf
    • https://static.usrfiles.com/ugd/0789d5_2cd7fb562ee245e2bbb70b232eba01bf.pdf
    • https://static.usrfiles.com/ugd/b4609a_0069ed5b1dca45c2b3e00a8765d3508e.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_off000087da.bin
9df344960965661d7e9c7c134a362c2941c4029ad950e36ed80e6f568e942415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DA 4928 bytes
font_01_sfnt_off000098ae.bin
4ccbd8c283b6bed221b355b64eb6f606b7e655dafe9ab50ad5e9fe0eda50098a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AE 15812 bytes
font_02_sfnt_off0000ca42.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 16036 bytes

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