Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e984ddf4c9dca6…

MALICIOUS

PDF

54.4 KB Created: 2020-08-30 19:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaf6bd2c6fa164926a478d177c72cfbe SHA-1: d88af7665ae1260baf96a5e599a2296741912c28 SHA-256: 83e984ddf4c9dca63f6d32c9425b5997f06f5959f9c3f68f76342fb8f7cbe02d
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=native+american+guide+eu4'. Additionally, another critical heuristic indicates a PDF link farm, with many links hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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=native+american+guide+eu4
    • https://static.usrfiles.com/ugd/04e6f9_ca018fa6bb4846889d5151f00348ae48.pdf
    • https://static.usrfiles.com/ugd/b8c837_083492c2e89a4c3b96d5e0ab96b34c90.pdf
    • https://static.usrfiles.com/ugd/6260fe_2903bce995ef4cfbad6854d8b521881a.pdf
    • https://static.usrfiles.com/ugd/09273f_18c0428c9fe04741a3e3de3d6264826e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9cc06c6fb374e959498cb5485af8591.pdf
    • https://static.usrfiles.com/ugd/136d07_83f1178494a94b2eb9801134596433f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1194370f7fe24c9aae7dbc812492f2fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e75b790cbea4b9398d784f0834df93e.pdf
    • https://static.usrfiles.com/ugd/accd1f_af632ea51111411b96d4357126954afe.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3faba924c5144b0899bbc2da6b149b6.pdf
    • https://static.usrfiles.com/ugd/0aab01_5bffc076edc145ffab31847f19ddc73f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae1002feafd14e38a9b8b3d76a79c158.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/2699120611.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/84472192771.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/852536440.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/fazaxisodekinibexeti.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/b8c837_3e75b790cbea4b9398d784f0834d

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095f0.bin
2164087f940d2a8bc973a18ede313c06bd8e79a164d418210b0243ad5714ec1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F0 5168 bytes
font_01_sfnt_off0000a776.bin
b0f5ba5f7ff8b10c5da0498e752fa6b5cad5f3b74e382bdce3422829f6811d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA776 11068 bytes

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