Malicious PDF — malware analysis report

Static analysis result for SHA-256 033aa5bdc30e23b7…

MALICIOUS

PDF

41.0 KB Created: 2020-09-17 03:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b5dc3764e769b5484b9d36ba23a345a SHA-1: 282b30cabc81e5200701918ba9a6ba6154971549 SHA-256: 033aa5bdc30e23b715d684acbfa7f24f7a35fcd0f2b5d986c968a64383c3ca04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, contains text related to the embedded links, suggesting a lure to external content. The presence of numerous links indicates a link farm or phishing attempt.

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.me/wix?keyword=arbol+nacional+de+el+salvador+dibujo
    • http://files.bostonmedstaffing.com/uploads/1/3/2/3/132303147/8ab7f1188f59.pdf
    • http://gofifi.aboverepair.com/uploads/1/3/2/6/132683071/bolana.pdf
    • http://nejodev.shadecreekwatershed.org/uploads/1/3/2/7/132740480/zagumusebawupudake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://58acda53-5de6-4ce5-bfda-3e871d4bda8f.filesusr.com/ugd/952c2e_ffee167200d94e5bbf353b7308c2b02f.pdf?index=true
    • https://21303680-a504-4b5d-a7d5-7018153eb5a9.filesusr.com/ugd/451a43_b8d490e4563e4dbab28ab3eaa75c43dc.pdf?index=true
    • https://f4c1e8f2-6360-48c8-a968-9b6614304aec.filesusr.com/ugd/baa514_251d76da8ead4f0c96e22fb43ed88511.pdf?index=true
    • https://8f2579eb-f20d-4193-8850-4141b5ca4647.filesusr.com/ugd/c638b7_439b2aee5f05498688a1cfa6350fb721.pdf?index=true
    • https://1c0ea213-dd59-4a61-8aae-462389226ce0.filesusr.com/ugd/696117_85fbf0b6c786431d824f579fb31e9018.pdf?index=true
    • https://7d7108bb-3786-4f7f-90ed-58f64a35b21e.filesusr.com/ugd/dcf9ad_4fb3382fa7534194b9b5904a85b6e500.pdf?index=true
    • https://68b55123-f390-4a4e-9d51-c6052283c3f5.filesusr.com/ugd/868b90_fc056abad9444cc08590c77cd1135e00.pdf?index=true
    • https://ac9e1a4b-d7be-4ca0-b64b-4f9a16a89d81.filesusr.com/ugd/1cfe37_36eec1df1d3a4eada010c564a35e5653.pdf?index=true
    • 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_off00005423.bin
62d23f34d565143bdc4f2a821ef6fd0764f0787ba6a374c69647c2cc3b1134f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5423 5000 bytes
font_01_sfnt_off0000651c.bin
e6890e8cb0ded4a56b927a4120342ff0538ec28af423d45c0ec4e503c470b3c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 10632 bytes
font_02_sfnt_off000087b3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B3 4324 bytes

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