Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8f7d7292324168…

MALICIOUS

PDF

47.6 KB Created: 2020-09-30 22:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c619c4a5b82ec610ab62b0a16401f076 SHA-1: ba3d47350625d62dc7a746ff95fe609b65fa3dd5 SHA-256: 4c8f7d72923241688ba02123c40a904b302afa65cc1c2b392104625cc8923bbb
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=burmese+days+pdf+free+download In PDF document text
    • http://niguzizi.alisonjanebowie.com/uploads/1/3/1/4/131453520/libagoriruripuxipaxo.pdfIn PDF document text
    • http://files.philippineboutique.com/uploads/1/3/2/6/132696015/bde31f74d52.pdfIn PDF document text
    • http://wizevan.laurahawbaker.com/uploads/1/3/1/3/131398455/rosanagidu-betodumizi-zirufaxi-zavowubu.pdfIn PDF document text
    • http://nulenuw.inglesespecializado.com/uploads/1/3/0/7/130740598/c69f909.pdfIn PDF document text
    • http://files.mnomusic.com/uploads/1/3/1/3/131378919/2981438.pdfIn PDF document text
    • https://site-1036820.mozfiles.com/files/1036820/16866681994.pdfIn PDF document text
    • https://site-1036812.mozfiles.com/files/1036812/12292544542.pdfIn PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/44926110612.pdfIn PDF document text
    • https://site-1036871.mozfiles.com/files/1036871/xutewuxezimopozadubikiko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9072/9376/files/wyrd_sisters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/the_autonomous_power_of_the_state.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/conan_exiles_remove_bracelet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/maxumuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4712/7720/files/daisy_powerline_5501_laser.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/smallpdf_to_excel_converter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1151/3252/files/finding_the_vertex_of_quadratic_equations_worksheet.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_off00007ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD3 5432 bytes
SHA-256: 92f4f23cfeac495c8ed37b996dd356810bc0812ced7199b8571f22dc133c97bf
font_01_sfnt_off00008d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4D 10608 bytes
SHA-256: 2385706af137abc7b5c0dadf1350dd3609849488099b7efe9fdff0c9015db1f2