Malicious PDF — malware analysis report

Static analysis result for SHA-256 65784a4688b6c5da…

MALICIOUS

PDF

104.7 KB Created: 2020-09-08 22:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5e24b24d7cdaf90893de4c098df225f SHA-1: c2759ae7c42424fa43330918208735f6ddc2c37a SHA-256: 65784a4688b6c5daa85bc9f8d976d861015135d3225dfadb98d2028afc4d9100
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text related to interview questions and a URL that appears to be part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the presence of a malicious redirector and the link farm heuristic strongly indicate a malicious intent.

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=mmi+medical+school+interview+questions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/5c139a_fee6c8a4fa9a40c0bc8c53d4429ee8da.pdf
    • https://static.usrfiles.com/ugd/fa6f14_6a0e5d89350e4105b6845815f90cc093.pdf
    • https://static.usrfiles.com/ugd/d775a9_0e761c56abdf438cbd324b26b402a6be.pdf
    • https://static.usrfiles.com/ugd/1e533a_9dbb9a9962b749d9bb35ad7bb651f49e.pdf
    • https://static.usrfiles.com/ugd/724bd4_5d527fc9ceca47e990aba3304fbb9981.pdf
    • https://static.usrfiles.com/ugd/b8c837_66e04090aa0b4d32b50ab3a6a798f051.pdf
    • https://static.usrfiles.com/ugd/35c6e2_c7721d2a7cdf40fbb71c9b6e032c5b95.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4cc09ce77144f481f2c42116eca8ad.pdf
    • https://static.usrfiles.com/ugd/787b0a_bb3d26d4901345dc98831cdd3abac972.pdf
    • https://static.usrfiles.com/ugd/80c1db_251da0503f5e4f3c8f3e8ff3c29ec604.pdf
    • https://static.usrfiles.com/ugd/b13fd1_e9a1a5609a334413ac70488d32e4933c.pdf
    • https://static.usrfiles.com/ugd/544c7e_c166474b04b6405c97d9f0f3a8a445fa.pdf
    • https://static.usrfiles.com/ugd/3e9e83_bee6f2ef1366426e82e232f3938e0ae5.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014fe8.bin
9b3b621b0001365784bdb2acb25289791f2150ccd74c8f33de3e08611743388f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE8 5344 bytes
font_01_sfnt_off000161f8.bin
96f03bdf184db871f637bd74fe9b8b755e0ba86acb1f21a5cfc7aff2913c413a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161F8 10816 bytes
font_02_sfnt_off000186c2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186C2 4324 bytes

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