Malicious PDF — malware analysis report

Static analysis result for SHA-256 61937fd569367d39…

MALICIOUS

PDF

64.4 KB Created: 2020-08-11 00:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd97d283f9bd57eb8342d876be5d8706 SHA-1: d3d5927c76dd9e3bd474238fc0f953b0074be345 SHA-256: 61937fd569367d395209969acf8e49f549e893b511011df7c1f46122394be17c
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to SEO poison, with one of the links pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=aparato+respiratorio+humano+pdf
    • http://files.faithbaptistsrb.org/uploads/1/3/1/8/131872269/339bd6de5b6d.pdf
    • http://files.happyphoneunlocking.com/uploads/1/3/1/1/131164317/namuveriza-zexixo-mazategokoret.pdf
    • http://jogomot.athenspalittleleague.org/uploads/1/3/0/9/130969744/e849a095c.pdf
    • http://files.beanwestcoffee.com/uploads/1/3/1/4/131482931/fukejogakaso.pdf
    • http://files.agilitydreammaker.com/uploads/1/3/1/3/131398547/5469d40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1798/4410/files/alumni_meeting_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/86651529300.pdf
    • https://cdn.shopify.com/s/files/1/0437/6762/7928/files/aflac_accident_claim_forms.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vonabubabosutogoxofe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/ssa_academic_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/adobe_editor_app.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/95498052054.pdf
    • https://cdn.shopify.com/s/files/1/0432/3416/4893/files/tesepaxefavona.pdf
    • https://cdn.shopify.com/s/files/1/0450/9509/2376/files/social_psychology_elliot_aronson_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/zorinosituwusavumaxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuwakuda.pdf
    • https://cdn.shopify.com/s/files/1/0440/8334/7606/files/fibras_textiles.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd71.bin
4c4cb0a24201e65f87d086737c1523ddd0f6a26a2b2799a5678595fa67236bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD71 5240 bytes
font_01_sfnt_off0000cf16.bin
3dbd0778c97306ff7b961ecd1f933bdb26b8e4da05c1c0cf907a9d3db2193d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 11472 bytes

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