Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1b5637ac0d56a4…

MALICIOUS

PDF

43.7 KB Created: 2020-10-11 21:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: d1f489be1086b180f10a52af0af2f6f3 SHA-1: c25def16ec6f6c412329ea4f922ffd411eb694e3 SHA-256: 5b1b5637ac0d56a4e6ab1708086a39a0d62fe28211f325cd9ea297a5d6d7380d
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://ttraff.link/pify?keyword=proyecto+1050+ley+de+armas In PDF document text
    • http://files.wbjk745.com/uploads/1/3/0/7/130739376/5401810.pdfIn PDF document text
    • http://files.cleveland-park.com/uploads/1/3/1/3/131380177/sodidimutas-murogobuj-tisanuj.pdfIn PDF document text
    • http://files.maryscreativespot.com/uploads/1/3/1/4/131407111/23aa5d8de7b6.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/1/0478/0536/6431/files/dragon_ball_fierce_fighting_2.5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4438/4167/files/15304782368.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8829/1003/files/xegalego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/xamevujijagunofafemez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/6719867695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/73372600732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2333/5063/files/trigonometry_test_2_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0860/5590/files/reaction_rates_worksheet_chemistry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2602/8456/files/morse_sewing_machine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7675/6669/files/fate_accelerated_stunts_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/gulelepaxavozimofumikuti.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_off00006893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6893 5504 bytes
SHA-256: 0ca6fe781973acc8075340651290acfbc8daeb3717432a5f627e1d2fc045aaad
font_01_sfnt_off00007b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3F 11520 bytes
SHA-256: 7ff5a3f5380f2cded02576cfb950d5805efbe465dd31e6db70c56794cc22764e

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