Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5ec8e5d22207a7…

MALICIOUS

PDF

44.1 KB Created: 2020-08-20 02:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a39d61fc5f269098045f159263b2f932 SHA-1: 936b46c19198977e389c393975cba4ed29f459bf SHA-256: 5b5ec8e5d22207a7b1034641a15b0149e8e5307a2de46c4fda405388aeab08d2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to appear as search results, with one prominent link leading to a known malicious redirector. The document body, though partially corrupted, contains text related to 'formal dresses' and the redirector URL also includes this keyword, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links points to a link farm or SEO abuse tactic.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=best+formal+dresses+melbourne
    • http://wepene.lorettolink.org/uploads/1/3/2/8/132814930/642c388089f0.pdf
    • http://files.kbninjutsu.com/uploads/1/3/1/4/131437623/muranigasone-kanituk-xukudipotuwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9290/2037/files/74319541471.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6975/files/l_appareil_gnital_masculin.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/47951351079.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/sexorilekasapabojewuka.pdf
    • https://cdn.shopify.com/s/files/1/0447/8612/2901/files/cameras_cctv_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/6776/8981/files/39065311820.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0439/files/30606091431.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0885/files/35061261848.pdf
    • https://cdn.shopify.com/s/files/1/0435/1492/1112/files/36945314061.pdf
    • https://cdn.shopify.com/s/files/1/0438/6055/7974/files/lowes_marianna_fl.pdf
    • https://cdn.shopify.com/s/files/1/0446/9525/7244/files/acta_constitutiva_ejemplo_corto.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9107/files/jesus_bleibet_meine_freude_chor_noten.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/dibodunef.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_off00006e77.bin
f7f7b9e251b1b02d5825733d5fe5394636771ac2408098c543ef1044d3e17c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E77 5244 bytes
font_01_sfnt_off0000802d.bin
717a738ff92d8800718e4128d42b53b9da360d1a938bdb182ed9070c1a86ce9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802D 10420 bytes

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