Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cff1f71752ac93…

MALICIOUS

PDF

46.5 KB Created: 2020-10-02 10:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ef23c597e934f6ddb3c5d0de86003939 SHA-1: 2a1c056e0f6302ddc12f285d5ce57df4f7329f29 SHA-256: 27cff1f71752ac934899b36bdc86525fd0bc3c8b92bf99204a9ee83c11a8c86e
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://ggtraff.ru/strik?keyword=general+chemistry+principles+and+modern+applications+10th+edition+answer+key In PDF document text
    • https://site-1038682.mozfiles.com/files/1038682/2855795112.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/90281068931.pdfIn PDF document text
    • http://fobila.pureessentialslightcenter.com/uploads/1/3/0/7/130739695/3636791.pdfIn PDF document text
    • http://rivonuv.alexjtunney.com/uploads/1/3/0/7/130775934/7989472.pdfIn PDF document text
    • http://files.ascensionlutheranshelby.com/uploads/1/3/2/7/132740250/bagoluzodaxazinuguwa.pdfIn PDF document text
    • http://files.ukesterbrown.com/uploads/1/3/0/7/130739154/115570f57d611a7.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/1/0438/5888/6806/files/joresisovog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/98631057241.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7171/5993/files/vocabulary_workshop_level_e_unit_2_answers_choosing_the_right_word.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9691/4586/files/22065744981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12371af8-f3da-4ff4-8b91-c01da7a987bd/23182196298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfdd4d3-afd2-4724-beeb-e810f64503bf/65982732046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75182d13-aefb-4e34-a6e4-93058737b7af/vofinojipotalat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896419e2-233b-4e9d-a580-fe0a79efcb60/57046433159.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_off000075dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DC 5796 bytes
SHA-256: 396b7edff6cfb0a1edcfc34292ccc881a290c453f3bef4292edd0018a9683057
font_01_sfnt_off00008988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8988 10076 bytes
SHA-256: 779a9b68409c6b025e4859a66cafa35c07745df5182339d20c7856ff0f454090

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