Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddd38c1d1012391…

MALICIOUS

PDF

54.4 KB Created: 2020-08-31 05:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbf05fa43adf1c4c6669e8d03a73bec7 SHA-1: ed4241e8970a0a4e240f51e439f967953acc98ba SHA-256: 2ddd38c1d101239115489ffe2a20f46f054ed0e008911dd8faf16ef6a85181a7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=resolving+conflict+interview+questions+answers'. This URL is embedded within the document's body text, disguised as a relevant search result. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern is social engineering to trick the user into visiting a malicious URL.

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.cc/wix?keyword=resolving+conflict+interview+questions+answers
    • https://static.usrfiles.com/ugd/c12414_71593bd06007437a9021d46023015d4c.pdf
    • https://static.usrfiles.com/ugd/760101_956d3b67489d48ac8b0efffab793baed.pdf
    • https://static.usrfiles.com/ugd/39cb9d_9200ef85fb6e4bc292891917500b08b2.pdf
    • https://static.usrfiles.com/ugd/5be868_8d038a8a40754d9d8dfc0213e51f9cf2.pdf
    • https://static.usrfiles.com/ugd/856cea_79fbed8e88f841b5b2e4e9c0d2893b1e.pdf
    • https://static.usrfiles.com/ugd/704566_ce9bf332b17d4a15b46eda97ddd48695.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_2432e2febb7b4534bd8ca5478b55ecc0.pdf
    • https://static.usrfiles.com/ugd/b50c55_f1b9e0cff11d47e0b22caa73abdb50c1.pdf
    • https://static.usrfiles.com/ugd/a86d68_157abf0eabb041bb89d9b148bcad865a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0de82c59e5914d0a97f4cb3f40464daf.pdf
    • https://static.usrfiles.com/ugd/fd3290_7a2033f75f234f2a9e1187e84e31da6c.pdf
    • https://static.usrfiles.com/ugd/f8de3e_d32afee3e79a4692805e1deee28a68f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_68a5d3c55f344a95a4998d1bb1290c7a.pdf
    • https://static.usrfiles.com/ugd/8b9728_bfe121079d7549ec9dffaddd9ef63a5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_344c2116375244afbd20eac82e2cce46.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/39cb9d_9200ef85fb6

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089e8.bin
5c31cde1825d8702942622171d2de68fbc4c43b1fd99c758e92b653c1d26655f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E8 5216 bytes
font_01_sfnt_off00009bcf.bin
4460066efcab0a1637a66a225070377b115b1d1594b805bd8d9e27ffed9d4ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCF 10080 bytes
font_02_sfnt_off0000be4c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4C 4324 bytes

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