Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc75d41457c275a…

MALICIOUS

PDF

50.0 KB Created: 2020-08-10 04:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e5c417d54fcf336d76a9662e06fcd82 SHA-1: 8a255542df1bbc6106379ef97eea6a8a5d11ddec SHA-256: 5bc75d41457c275a494d17bfa3b4d875300a92306bdbd1a17c73cbd6cb592bfa
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as an 'uptet revised answer key 2020 pdf'. This suggests a phishing or scam attempt to redirect users to malicious infrastructure. The presence of a visual download button further supports a lure-based attack. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=uptet+revised+answer+key+2020+pdf
    • http://files.bacmedicaltourism.com/uploads/1/3/2/6/132681587/xesezotatus.pdf
    • http://files.nejnamc.org/uploads/1/3/1/6/131607346/bujowadatasivo.pdf
    • http://files.cleelumroundup.com/uploads/1/3/1/3/131398234/ginafa-zisumi.pdf
    • http://files.oakwoodequestrianfl.com/uploads/1/3/1/3/131380343/3afe26741.pdf
    • http://files.ritchierealtors.com/uploads/1/3/1/4/131482975/gibovaxodanaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/kigepolulizutijozerazam.pdf
    • https://cdn.shopify.com/s/files/1/0432/4206/1986/files/xisivasupokubavadisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/91661304409.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0025/files/latin_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5676577217.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/7413406670.pdf
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/inkscape_export_as_svg.pdf
    • https://cdn.shopify.com/s/files/1/0439/0980/8283/files/pewedivivepawe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/12385714871.pdf
    • https://cdn.shopify.com/s/files/1/0435/1043/1896/files/27382253881.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/kotovetegosejoraso.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_off00006178.bin
a3a297db47b7a7ae6e127d7edf34514caee14349eba34100a59d4ee6e2f395fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6178 5588 bytes
font_01_sfnt_off000074ad.bin
17c6b634d1891a162d7d6b527b717a2248f6ef28c31b3b58a764366cf8b2955d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AD 15340 bytes
font_02_sfnt_off0000a40c.bin
7572e8f7c47b31d3d2d05977b111753a840e98816793d1b3630908ffeacac53d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA40C 6488 bytes

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