Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a51b2840add14b…

MALICIOUS

PDF

47.0 KB Created: 2020-08-23 17:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 57b4a155ade59c4fa4f753698260f634 SHA-1: 339082c93bdd27fa413fa29c4dd6935ee1389404 SHA-256: b9a51b2840add14b932c0ade78119baa8d60f5492dd39c67cc38b7282b5280f3
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=mdpi+remote+sensing+template In PDF document text
    • http://jegavafaf.nancyhallock.com/uploads/1/3/0/8/130874038/bonenawivamivepejol.pdfIn PDF document text
    • http://files.southtownscatholic.org/uploads/1/3/1/6/131636990/3996155.pdfIn PDF document text
    • http://rebikasez.baieslings.com/uploads/1/3/2/3/132302842/a6a58cc.pdfIn PDF document text
    • http://files.houndheritage.org/uploads/1/3/1/1/131163684/falunudugipa_badusin_nenepine.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/1/0431/5168/7848/files/21019307936.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0843/4081/files/jogelaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/4824458062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1612/5590/files/47895249374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/77227085643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/86567128822.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/0937/1286/files/cecil_internal_medicine_25th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/muledi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/autocad_software_free_full_version_2013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9105/8070/files/k_cup_chai_tea_nutritional_information.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/bengali_alphabet_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6238/6074/files/danapitibojozonirinukeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/revelian_cognitive_ability_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5565/1743/files/film_on_4_tv_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8446/3784/files/pedosesunefuposonakev.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_off0000792e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x792E 5284 bytes
SHA-256: fce9fd1abb81c3c4700118f1e3181c97d2d23341457a9d198f67e8487e262048
font_01_sfnt_off00008b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1A 10404 bytes
SHA-256: d8cebce5bd1e4667108f99f2711f2f307ad35699c86ce2ce82576d2a9d875f33

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