Malicious PDF — malware analysis report

Static analysis result for SHA-256 5590a91726f2b273…

MALICIOUS

PDF

49.5 KB Created: 2020-11-06 14:26:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 79884a63937b675a3f61e7171e11ea44 SHA-1: 4cdc27ce603b2068c951a25126630c35b2ab17e2 SHA-256: 5590a91726f2b2736fc2fae6411448ccf8a1785924f57b00b0b40c53007f78c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links that point to a known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is designed to lure users to a potentially harmful destination. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://traffine.ru/123?keyword=chakras+and+their+meanings+beginners In PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/pomuzobimir_wolenep_zagur_xarifakefe.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/gurowozenupifi/jumbled_story_for_class_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435abb95-39a6-4576-87e6-7b3205279e3a/bimotiw.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/isa_304_rainbird_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7efb0b8-1149-4b07-8f00-8998b8b54f26/craigslist_chicago_illinois_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/sekaiichi_hatsukoi_episode_1_kissanime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d461b0-1193-4eda-9a5c-c2e64d7957e5/28008518952.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/advocare_24_day_challenge_for_nursing_moms.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/22088373159.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/vigepemivexupununixida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6acc24-94a2-45fd-b80a-a48419503570/17183787739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea777f4-5a25-4434-aa08-71375e11ee1a/87843490495.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/manual_for_duralast_jump_starter_750.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_off00008603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8603 5316 bytes
SHA-256: f4a3a6f45220da48a46cb2ce1493d48a7a110a2ab87e6d2bb3201e81afd55a79
font_01_sfnt_off000097e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E5 9828 bytes
SHA-256: 4adf33dc321e3fa9c60cc3be59d94901f56c902582fe39b01e2dd97bb4aeaa6a

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