Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31a4ef9f5223bfb…

MALICIOUS

PDF

51.6 KB Created: 2020-08-14 11:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b9aae77552884f7d6fd6cfc3c86108b4 SHA-1: 671efcf1e167b7fa2b61d546cf2d19603bc6dab7 SHA-256: a31a4ef9f5223bfb68975a3592b44a72185f356d499a331b176f0112d78a2e89
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.cc/pify?keyword=formel+1+%25C3%25BCbertragung+2019+sky In PDF document text
    • http://files.redenviroforum.org/uploads/1/3/1/6/131606101/nenapazatuxuw_solimolozado_zunupofedesewul_sijutiti.pdfIn PDF document text
    • http://nabeluget.northhadleysugarshack.com/uploads/1/3/0/7/130739678/jovosivijunorifaz.pdfIn PDF document text
    • http://files.emilymariephotographie.com/uploads/1/3/0/8/130814411/1325793.pdfIn PDF document text
    • http://files.condzellasfarm.com/uploads/1/3/0/9/130969555/97c8dd5b0b0479.pdfIn PDF document text
    • http://files.bakemydaycakes.net/uploads/1/3/2/6/132681713/6988312.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/1/0429/9735/0554/files/limorex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/63220010495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5046/6471/files/sonegav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/nesatodarufovosamad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/tojebazileba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8575/8618/files/fidalogulozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4686/8891/files/19017150732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/2465/7056/files/the_canterbury_tales_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/xuburakewavizanazudi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6933 5868 bytes
SHA-256: 79fec2429cf435a6b695ce25c87f87bbd6d7a953a1e01fad43c92328b7dbfd3a
font_01_sfnt_off00007cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEA 11440 bytes
SHA-256: 2d8233a0ae21e8d8732f11f1084f3ad12e574fb33ef4449accac10eaa322c613
font_02_sfnt_off0000a245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA245 18536 bytes
SHA-256: 9c4bbb9f72d165051f892934f4449b728124010582402d1b9d95ed60224ede0d

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