Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db87ce2a78db838…

MALICIOUS

PDF

36.2 KB Created: 2020-08-30 10:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7117f6b887d8983784886a7391bfbf2 SHA-1: 96d8e88285aeac295934fc9bd75965dab346bb0b SHA-256: 9db87ce2a78db838f7795377b8a25149a5555364e5e7e802b3557db56c93da1b
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector (ttraff.ru). The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains a reference to the ttraff.ru URL, suggesting a redirection or SEO-based attack. The presence of numerous Shopify links, while many are benign, contributes to the link farm heuristic.

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=romertopf+clay+pot
    • https://cdn.shopify.com/s/files/1/0433/4462/5813/files/93945015396.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/wobewugajaviwot.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/41353509319.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0023/files/aimersoft_dvd_ripper.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/wreath_builder_templates.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/faxebelapimasiledewuwige.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0530/files/islamic_calendar_2018_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0432/3688/4642/files/29510227359.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/online_application_form_1093.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5911/files/teperojasipodadulosa.pdf
    • https://static.usrfiles.com/ugd/628a76_22ec634815384ecc9517eb314a685c0d.pdf
    • https://static.usrfiles.com/ugd/ecec20_97ca439ef8be49cb94d35804d0cf19cd.pdf
    • https://static.usrfiles.com/ugd/dc98cc_08d85b8c5c8a4ab28a152e751f93c8b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_373ce20d6860424db49265a61ef8f6a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_88832ff918c442568b08c5cada25cd28.pdf
    • https://static.usrfiles.com/ugd/30e015_c95324651feb41d893bbe42c07494cfd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e340b4e0341b4c08a2f918c0e687e228.pdf
    • https://static.usrfiles.com/ugd/8cbfce_bfd5ca0ec4b0432b9254dbde91189bc0.pdf
    • https://static.usrfiles.com/ugd/67e251_99128f0de81f49d281bda26e97d6ca7e.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/
    • https://static.usrfiles.com/ugd/8cbfce_bfd5c

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fd5.bin
9866bef2e91b41ef3174f4c13166ce13f4079069d5a6d573bf579e0fd9358d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD5 5092 bytes
font_01_sfnt_off0000611f.bin
6bb2acae50d305693853dd222e995b8ccb08e549252a7ccbdcf6a80e8ac36e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611F 10196 bytes

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