Malicious PDF — malware analysis report

Static analysis result for SHA-256 395b55d9bdcb8be9…

MALICIOUS

PDF

44.7 KB Created: 2020-10-12 10:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4ef6b54bbd06a6adb5aefb027f583843 SHA-1: b1d465ee266022c1879a35b2c8648efd1c1da968 SHA-256: 395b55d9bdcb8be9b22656a1b943e260eb7946f62f8e084c9541b7a07786c62a
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=physical+education+syllabus+for+shs+pdf In PDF document text
    • https://site-1037132.mozfiles.com/files/1037132/simutofolufutomol.pdfIn PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/80165687099.pdfIn PDF document text
    • https://site-1043848.mozfiles.com/files/1043848/88430877357.pdfIn PDF document text
    • https://site-1040003.mozfiles.com/files/1040003/62502688136.pdfIn PDF document text
    • http://files.zanniafernandez.com/uploads/1/3/2/6/132682833/4059788.pdfIn PDF document text
    • http://files.mieswholesalemeats.com/uploads/1/3/0/7/130739415/97bf9ed13682.pdfIn PDF document text
    • http://tejenezi.vickipedia.co.uk/uploads/1/3/1/8/131857544/a8cbc01c62.pdfIn PDF document text
    • https://site-1037903.mozfiles.com/files/1037903/dumixezimu.pdfIn PDF document text
    • https://site-1041609.mozfiles.com/files/1041609/xiniwanenegulige.pdfIn PDF document text
    • https://site-1040766.mozfiles.com/files/1040766/87483873073.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/xunaroporitopiladorevetu.pdfIn PDF document text
    • https://site-1037882.mozfiles.com/files/1037882/88615429463.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/1/0433/9813/5966/files/59784184011.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1896/4122/files/el_ser_y_la_nada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3841/1422/files/dr_driving_hack_apk_1.49.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/29642306212.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/42832625186.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_off0000700c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x700C 5484 bytes
SHA-256: 706c7da3b30451c043667c54ae7ef2793e9196ceadbb93e9f6a9f24f7590cc1f
font_01_sfnt_off00008297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 10176 bytes
SHA-256: 3149da7b9f85c0977ee16c4517ba7741a2e2cefeff70c4bc2d10a560a471c696

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