Malicious PDF — malware analysis report

Static analysis result for SHA-256 379de15cde0bcdf2…

MALICIOUS

PDF

49.3 KB Created: 2020-10-26 04:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a68edb2421102d61b4fd81e339e7311e SHA-1: 95cf9beac2279028982b14bb2b0b6360675eae49 SHA-256: 379de15cde0bcdf22317bed5549e3a81ec73da5c77a680b01934085d4e9b0790
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This suggests the document is designed to lure users to a malicious site, likely for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/123?keyword=skewed+t+distribution+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f8fcbdb5e6a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5f9463051edd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/january_2017_printable_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/sibebekonef.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/figinebenagulaperud.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/merovixanel.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/agua_de_beber_en.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/demonstrative_pronouns_exercises_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04641810-fffc-4a76-b569-669d0884ce52/21867232390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54238ec6-632e-4f27-9986-5724be56cd96/generic_non-pnp_monitor_on_standard_vga_graphics_adapter_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/67891512497.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/1779346748.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/86949129024.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/tubizipama.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/fewujo.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_off00007cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC3 5192 bytes
SHA-256: 02c6ce6a8f11fc4ec8d27e07ffeb01fa69e7844700a0755e32280505a986593a
font_01_sfnt_off00008e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E90 12200 bytes
SHA-256: 4fead9901cc29a17c5583874ec477e3e83992ace675ab86bd13d1a03677ce4b3

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