Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f60920710c1fc4…

MALICIOUS

PDF

36.7 KB Created: 2020-10-29 23:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ef4a746551da44de5e9f8ac0d8ab8e4d SHA-1: 3613ae9eedf72a10b16c9b575dfecdec770f4092 SHA-256: 59f60920710c1fc4c177f21cf09820e233ebc1b7503e15f3693d4911abdbf697
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links, many of which point to redirector infrastructure identified as malicious. The document body and extracted URLs suggest a lure for downloading game-related files, likely a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the presence of redirector links supports this assessment.

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://ggtraff.ru/strik?keyword=bloons+td+3+apkpure In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5f93ced5204ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f872068c8ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5f9170613a1bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f8fbbaaa02bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5f977844af9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5f98fa57e34cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/473b5dff-e336-45f6-9d6e-773c824db185/46401795658.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/zirovimowizo.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/cbse_class_12_biology_ncert_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/xesomozi.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/jolibomowazenez.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/multivariate_data_analysis_hair_black.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45ED 5232 bytes
SHA-256: e90924459f3432ffc8a07a859b91b5e9cdad4b0244b2c6c7a03390330ca2b08e
font_01_sfnt_off000057c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C0 2172 bytes
SHA-256: 5841ed57288982870a2c189bc49f844206838a6d49052d1df84a3877b7beaadd
font_02_sfnt_off000061c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C3 11096 bytes
SHA-256: 66f52afe7c7c07659ee64f09ea290876de2377309d1ea499f16dabac0debcc20

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