Malicious PDF — malware analysis report

Static analysis result for SHA-256 78591a9e2557e58c…

MALICIOUS

PDF

36.2 KB Created: 2020-11-05 04:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9a82f42001939514330fda3bab8fcadd SHA-1: 9198ef22b95bf13f84ccf643fc0d7b410b23b0fc SHA-256: 78591a9e2557e58c359f87926dd657100d418e4e6d580e410c614c6123364344
134 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary redirector URL, suggesting an attempt to trick users into visiting a potentially harmful site.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/strik?keyword=tar+urban+dictionary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5f9c5a71eaefe.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/645476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_5f95b851b6770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_5fa275f6d415b.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/4562352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5f8b3f6eb9630.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdd5d1d-d6a6-46d2-a843-0c09ce663d93/13995049535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5dfd082-cb96-4820-b8cf-fafd17062de6/trentinotm_deluxe_outdoor_fireplac.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/compound_adjectives_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c4e80d-3e40-460f-a124-d946c1662385/nuluse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f50e7cb-9a93-4e53-aa1d-6dffdcfa276c/major_ian_thomas_the_indwelling_life_of_christ.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/download_holy_quran_with_urdu_translation_in.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F98 4916 bytes
SHA-256: 7ec631f31dc6cd13f490bb64b4404258363878c41cd449826148f01d1f7587f0
font_01_sfnt_off00006065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6065 10400 bytes
SHA-256: 9ee40c848b7da26a6252ce692b86b82e3166aaaeefa273310a297b77eff8c17f