Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d7131717ebd5f…

MALICIOUS

PDF

56.8 KB Created: 2020-11-01 07:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd40fb8d96a5c8ee8ec903494ef077c7 SHA-1: 1fa2d9467d489de2811137856e56c3885842f392 SHA-256: a66d7131717ebd5f9041e9093d1ccbae741189ca080b2e00293bbae8909f846b
102 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL as the malicious link, suggesting an attempt to trick the user into clicking it. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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.ru/123?keyword=remember+the+titans+questions+pdf
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f9c515b28823.pdf
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5f913b1e6d517.pdf
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f9e1bffef903.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/luroniwabukegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0498/3534/4034/files/john_deere_z425_mower_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0503/1270/8293/files/ipcc_standards_on_auditing_short_notes.pdf
    • https://s3.amazonaws.com/donake/hatsune_miku_dress.pdf
    • https://s3.amazonaws.com/luramamelolem/60236645444.pdf
    • https://s3.amazonaws.com/vexeliku/karsus_avatar_spell_components.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_off00009eac.bin
35e03bdab6faae7414cc7efd3cb3d3d4b8cdf9ec3619a541d829246077716492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAC 5524 bytes
font_01_sfnt_off0000b13d.bin
42ba194bf9fdeece3845cafa2edec4b1c31f047261433d0ae7cf004e09cd9d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB13D 11080 bytes

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