Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2b0854c0c9df23…

MALICIOUS

PDF

45.4 KB Created: 2020-09-14 10:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d4f7b813b32488f2ea2800a301cbbda SHA-1: b03eb5c56a5e8a8e026f44c0765585253b69a42d SHA-256: 6d2b0854c0c9df23b29e4ef16845d2b6b972e882aa933ad34dd5377f02ac9c63
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified as a redirector. The document body, though partially corrupted, contains text suggesting it is a test form, which is a common lure for phishing or malware delivery. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports 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.club/wix?keyword=course+1+chapter+11+statistical+measures+test+form+1b
    • http://files.maieutic-arts.com/uploads/1/3/1/4/131406535/tisifuder.pdf
    • http://xonaparo.elephantmomma.com/uploads/1/3/1/6/131637021/kewebalepoleg.pdf
    • http://burobar.eastwinchester.org/uploads/1/3/1/4/131453133/bb078321f8746.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/3835dd_7d7c962c0e8b4ed988363242bd753452.pdf
    • https://static.usrfiles.com/ugd/4117a9_0ba73e300da14eaeb1c83a72a86ee223.pdf
    • https://static.usrfiles.com/ugd/ef253e_79e1ccd54925410698fe750498daa28f.pdf
    • https://static.usrfiles.com/ugd/23924c_beb278c5232146cebae1637ce539aeca.pdf
    • https://static.usrfiles.com/ugd/b8c837_f68ba551c4664203a2ecacec1817c8da.pdf
    • https://static.usrfiles.com/ugd/544c7e_7a155792bce64cf0a08385948a5b1548.pdf
    • https://static.usrfiles.com/ugd/3f4b99_cfd52515a0d445909009c2bc98f632af.pdf
    • https://static.usrfiles.com/ugd/769f78_38c7ca186316458da566546f205ab2d1.pdf
    • https://static.usrfiles.com/ugd/3fd21f_bcf1b2486ee94528832645010d7030ee.pdf
    • https://static.usrfiles.com/ugd/3b5dd9_743124a5a8fc47d58a30d3efea8ca60a.pdf
    • https://static.usrfiles.com/ugd/8da65f_7acd387166bf420e84aab863e6543bc6.pdf
    • https://static.usrfiles.com/ugd/4b68be_e852ce66e0fa4e0484ea3eb02c6ab907.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_b1bc99cea2da486799389d3e7555fe99.pdf
    • https://static.usrfiles.com/ugd/65e777_1b0703c8babd4695a40a2d2ec6f86888.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_off000063a5.bin
6b7b2fbaaf85ec6a03dfd74d01e420b8efbc2afbe9ee17026fce4c77147ead10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A5 5244 bytes
font_01_sfnt_off00007588.bin
e0271bd15c3ab4ce4c892d382be5e206c46e109082f4735c0fd9fd2d6f2db0fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 10608 bytes
font_02_sfnt_off000099ac.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AC 4324 bytes

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