Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7cb9859045b164…

MALICIOUS

PDF

44.1 KB Created: 2020-10-10 12:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1a49c9d2d43a20e8ce469dbfd1f59f53 SHA-1: 27cbabec44acccf447573cb0599efdb04c6298ec SHA-256: 3f7cb9859045b164713c2f11e1d34744aa4e88688c8c2e7668521c0b70a59cc1
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=amazing+grace+my+chains+are+gone+she In PDF document text
    • http://nirixesan.mydailyconstitution.org/uploads/1/3/1/3/131379117/xinufuwidizotes.pdfIn PDF document text
    • http://files.hallingburychurches.co.uk/uploads/1/3/1/4/131409385/2468126.pdfIn PDF document text
    • http://files.thebreckenridgehemp.com/uploads/1/3/2/6/132695892/df80391b78.pdfIn PDF document text
    • http://files.mdpropertiez.com/uploads/1/3/2/6/132680874/5409574.pdfIn PDF document text
    • http://files.crossroadscowboy.com/uploads/1/3/1/6/131606605/mudeguxojoxu-sinigafilefavuz-bagubulumirav.pdfIn PDF document text
    • http://files.mthopesanctuary.org/uploads/1/3/1/4/131453818/bb82da08b6e1.pdfIn PDF document text
    • http://files.lifephotofl.com/uploads/1/3/1/3/131381640/gerekupu-lusuzuwudosud-jijeva-xefov.pdfIn PDF document text
    • http://files.gillisplayandlearn.com/uploads/1/3/1/4/131453215/kavalawizokibalo.pdfIn PDF document text
    • http://bakivuna.dasdk12.net/uploads/1/3/1/3/131398455/3db265cf.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/1/0477/1751/5420/files/the_secret_life_of_bees_lilys_mother.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9503/4529/files/litutifoxuwegevenugipanug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8642/0893/files/pelujapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8709/4694/files/air_innovations_fan_with_remote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6271/2728/files/register_of_deeds_durham_nc_marriage_license.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_off00006f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 5320 bytes
SHA-256: deea1da0f59e80e07f4dbd46c393f597b629a9c81611bb62d9e994edb27cc19e
font_01_sfnt_off00008134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8134 10116 bytes
SHA-256: 02fe66847d80ae353d71a3ebfe90f79669a5ff6ddceb9405cc483a6b2b07a637