Malicious PDF — malware analysis report

Static analysis result for SHA-256 9113884f6937cd39…

MALICIOUS

PDF

41.9 KB Created: 2020-10-13 23:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: a6db62fe56b986ed4fa2b5e9ead31863 SHA-1: 43849fea1d83947dd769f47d8cce17462fe0c77e SHA-256: 9113884f6937cd391f39d13dac6c481495399d5de48d0367c8e49fea2f90fdfc
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=malaria+treatment+guidelines+2020+kenya In PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/51866123020.pdfIn PDF document text
    • https://site-1038940.mozfiles.com/files/1038940/20663239619.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/sulusilalope-jobede.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/1/0497/3084/6881/files/30118072927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/zonubusefuke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0573/8660/files/texas_go_math_volume_2_answer_key_5th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/tufoxuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4689/3730/files/mulan_shan_yu_bird.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9037/0975/files/dell_inspiron_15_p66f001.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_off00006345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6345 5588 bytes
SHA-256: 8f194a48b0d4eecf2adc1e3aac3ab1f829ae2ed7523503e7ae006832d545b72e
font_01_sfnt_off00007643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7643 10620 bytes
SHA-256: 6cc6d61551700b41a35013835917a8ae1dcd01feac07b3efb5ed12d687e626c6