Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cca86b2a6e03b4…

MALICIOUS

PDF

33.7 KB Created: 2020-10-31 03:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 90a44f407a04689f2d6ccf4101d6f1c8 SHA-1: 9ec74a419d5532f4c921af120329c2d6ce367a70 SHA-256: 39cca86b2a6e03b475c44788793c6012bac150edc9c88199c45f247b7d62b8e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it links to a malicious redirector, specifically designed to lure users with a "free download" pretext. The embedded URL `https://cctraff.ru/aws?keyword=first+impressions+salon+oviedo` is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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/aws?keyword=first+impressions+salon+oviedo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f8dbf44863b4.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/7148387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f939681b386e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f920a9e48dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5f8dec28cb4ae.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/7d69f5a4-5281-4ec8-b7c2-c1478563fdb8/xuvevojanago.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/62569046273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688a5a19-1985-4aff-96a5-529382e09d1f/16130564670.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/74432713596.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/traductor_de_documentos_de_aleman_a_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/king_james_bible_free_download.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_off00004432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4432 5120 bytes
SHA-256: 39de089d16c44994599f2642b0b82bdb57f877514a2590fd4919c1ea78bd1ad8
font_01_sfnt_off00005589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5589 10760 bytes
SHA-256: f219eec730eb2d93c4d30207feb0375b2fad4836420d5da0b9a6e1f833ce1ef9