Malicious PDF — malware analysis report

Static analysis result for SHA-256 52554561eb67ee9f…

MALICIOUS

PDF

44.8 KB Created: 2020-10-04 14:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 881f1c9d4c42c846b1648bd86701f2be SHA-1: c9f15da609b10593769c55b8c4db55ec51789080 SHA-256: 52554561eb67ee9f584ef7d3f8977fc714a9f2037bf66545e0a00e2ce76352ed
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://gettraff.ru/strik?keyword=kanabo+vs+tetsubo In PDF document text
    • http://files.reimoves.com/uploads/1/3/0/7/130739996/19900b31724a3.pdfIn PDF document text
    • http://zagumubis.dionkliner.com/uploads/1/3/1/6/131607305/muxofinives_jilefevamir.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/1/0440/1332/2398/files/44001741695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/77603517907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3467/5880/files/vedabazazomuzadelonuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/hhmi_phylogenetic_trees_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2265b6-6ec2-4ab6-a79f-3fc0b2f90de4/37994018246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a1d461-f7a8-47a3-bb08-51239fef9ea0/5244161458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5192b6a-d847-4c8d-867f-1ff414ff3dd6/vonuwetoloxunodotijagasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d9a0c2-08fb-4f1b-9eec-ab1c0fd418d0/29463947116.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A9 3868 bytes
SHA-256: 5178a250d9d11344cd108022d135c23e827cdc4ab84ed7a5d09514720e381c22
font_01_sfnt_off0000734c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734C 4720 bytes
SHA-256: 5c0d05cf6b0f4ab61188fb7a2ecbf7d309d795629b975570803817a32f37d2f8
font_02_sfnt_off00008379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8379 10240 bytes
SHA-256: 8d0ad9fc866a73571b0dca86912eefdd62c1b4375a25a7bedce7c8efddb179fc

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