Malicious PDF — malware analysis report

Static analysis result for SHA-256 023195ed87d866a6…

MALICIOUS

PDF

47.7 KB Created: 2020-08-18 15:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b8351398acc447fafb12571b99cc6c SHA-1: ba54c99a61c5c35c79bbcb4fabe9241cbaf5c335 SHA-256: 023195ed87d866a6bef9a2feeeee5356338b4c252f75f4142a1338a436c8b07c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, suggests a lure related to a 'Microsoft word contractor invoice template'. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=microsoft+word+contractor+invoice+template
    • http://files.newsunyoga.co.uk/uploads/1/3/1/3/131384442/3a7fa725d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5669/2390/files/81582418553.pdf
    • https://cdn.shopify.com/s/files/1/0440/3511/3110/files/84945196114.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/angebot_absagen_freundlich_formulieren.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/finnair_a330_business_class_trip_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/4823/9257/files/82824162807.pdf
    • https://cdn.shopify.com/s/files/1/0444/3717/6487/files/latest_android_games_apk_data.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3408/files/1317026722.pdf
    • https://cdn.shopify.com/s/files/1/0434/7209/3336/files/84536942547.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/audacity_for_windows_xp.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_off00006dc5.bin
2ad9b9ae7b76043212958ec82e98e3cf43aa94b2bcf53b912b09e2d73fa100cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC5 5244 bytes
font_01_sfnt_off00007f92.bin
55492d4891eabb8ed8dae07b81dbef2a0472863eb7095c3b6e32463459b8f4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F92 10556 bytes
font_02_sfnt_off0000a38b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA38B 4324 bytes

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