Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8a31f98c93d2f1…

MALICIOUS

PDF

50.4 KB Created: 2020-10-07 02:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: e50977b597f30d99548cc0e6c93713d8 SHA-1: f670fdfcf109e46e269d2646e0185e17529e2180 SHA-256: 5a8a31f98c93d2f18e5786453c79c5b76760e8ec560c03d9ab3e7a3ba6ca5daa
134 Risk Score

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://gettraff.ru/pify?keyword=course+2+chapter+8+measure+figures In PDF document text
    • http://files.smoochfoto.com/uploads/1/3/2/6/132682233/2a9d49e09017f.pdfIn PDF document text
    • http://files.kcmetalsmithing.com/uploads/1/3/2/7/132712163/zediworuzajoxarego.pdfIn PDF document text
    • http://fagexeti.columbiasoch.com/uploads/1/3/1/4/131437657/goguruz.pdfIn PDF document text
    • http://files.region4convention.org/uploads/1/3/1/4/131454098/2305997.pdfIn PDF document text
    • http://files.charlieleephotography.com/uploads/1/3/1/3/131380942/temesumet.pdfIn PDF document text
    • https://site-1036785.mozfiles.com/files/1036785/tiwokenazaxoxepevabogu.pdfIn PDF document text
    • https://site-1040171.mozfiles.com/files/1040171/supakuj.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/e16b9c5e-cc90-4393-b5cf-24d31e00ffc4/41516260565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1974299-ce1e-4e09-820b-e04cb51b600a/93153805110.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_off00008637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8637 5628 bytes
SHA-256: e20ad7e5d539f72d08c4961199f472eccda0f86536d2ada085e52b513ecbbec7
font_01_sfnt_off00009932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9932 10648 bytes
SHA-256: ef94a5b65ef397304edf939f36ece8380234d1d33bc40251ad14453c36378c89