Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0d841b6f5eed23…

MALICIOUS

PDF

57.5 KB Created: 2020-11-03 01:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 0d92e73b874d9e321eba424a9bb66d74 SHA-1: b57f23a989861d34794812ae8e3e9a16368e0b9a SHA-256: 4a0d841b6f5eed234c05fd99203eab2e1d443923d39ee9cf8118e9e4dfca3ea7
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/pify?keyword=unit+1+the+chemistry+of+life+answers In PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/davad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_5fa08bec709af.pdfIn PDF document text
    • https://xigijoxupawise.weebly.com/uploads/1/3/3/9/133999412/5d864b9d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f8d2724b03cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae92cbed-58ea-4b93-9af1-de5a27f83681/sikupi.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/31047477026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5f0ccf-876e-4694-ba4a-8a756a5835d5/66067332571.pdfIn PDF document text
    • https://s3.amazonaws.com/mokavilez/ucla_math_31a_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463f52f1-172a-479c-9fc0-790995240d0b/domasipuwobawagizeto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3282/6803/files/ganava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13859af1-836f-48b5-bc93-2dace6189e07/wiweju.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79BC 5356 bytes
SHA-256: 1ab80b6f6c1348ae991a0ac0d5680b568852a4db3c07d954af2b92e35b3bf6b1
font_01_sfnt_off00008be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE1 3972 bytes
SHA-256: 96dcd381fae1c9c0b6958b5d207307b21f5fa80b39c05d886a63875a7c112998
font_02_sfnt_off00009b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3B 12212 bytes
SHA-256: b91361bb00d5f8011b84ccfff6e4f181035424ce41abe5ca84396459b021e9df
font_03_sfnt_off0000c1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F8 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f