Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f1b2cd261e4137…

MALICIOUS

PDF

44.3 KB Created: 2020-11-01 00:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 16bc2755503d6baaaacd213a489d6584 SHA-1: 4ead56f2a432987e508bcb631083e7edfe968735 SHA-256: 88f1b2cd261e413714ae382db6f7326bdcccb5db448bdbe2442e0c4997af4efb
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/aws?keyword=a+rap+on+race+pdf In PDF document text
    • https://josafobuwevaj.weebly.com/uploads/1/3/4/4/134464642/2924198.pdfIn PDF document text
    • https://sujibume.weebly.com/uploads/1/3/4/4/134442643/522452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wonoti/gotuwajiwaresoxobunesuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/btec_level_2_first_hospitality_student_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7412/5465/files/61438873362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7855/2218/files/54581160809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b449b336-faa6-47af-927c-9a76348a81fb/34692795198.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/werema.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/effects_of_water_pollution_on_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/pukasojalu/the_giver_quotes_about_freedom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1788/6622/files/xivedekusivegatuburezij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0417/4246/files/gurapokovutuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/taxanojupitaf.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/sivedejidixog.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/javenozuwobivam.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_off000070ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70EE 4928 bytes
SHA-256: 28d923d2c8ca25204f050d3d8a8eee03c647b897a44ff3f8679c4081705198b1
font_01_sfnt_off000081c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C2 10244 bytes
SHA-256: 037c1b1b921defcc256f34c54248e639895582ad519d738c8c3769783f5b6991