Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd7e991528980e7…

MALICIOUS

PDF

50.2 KB Created: 2020-11-08 01:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3708426e81c561eafb09ef61cc5a1fb9 SHA-1: 1a923634ef027d9d8ae9ae071a36a7c4e7003a76 SHA-256: 9fd7e991528980e767aab6f9caf86034067aa1a7e8b054f98c6fa6b4d507ad77
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a known malicious redirector infrastructure. The primary redirector URL is https://traffking.ru/aws?keyword=pathfinder+ring+of+swarming+stabs, which is likely used to obscure the final destination of the malicious content. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users into clicking through to potentially malicious sites.

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://traffking.ru/aws?keyword=pathfinder+ring+of+swarming+stabs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_5fa4649a5461b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5f9afd7ae03ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f87d04805466.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/3905791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f8c0fdd5f0bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5f91c84e132db.pdfIn PDF document text
    • https://bujubisagakib.weebly.com/uploads/1/3/4/3/134323903/4deb9732e012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5f9c3f4c3a45e.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/9038309.pdfIn PDF document text
    • https://jokonufukitis.weebly.com/uploads/1/3/4/3/134399540/748103232ee.pdfIn PDF document text
    • https://kexoxuneve.weebly.com/uploads/1/3/4/5/134501441/jepirazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00008033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8033 5524 bytes
SHA-256: 8a81a30ef679df45e406cfe43ea957e21aac6d03d3cef25c0130a8576ca9d3a9
font_01_sfnt_off000092e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E4 12028 bytes
SHA-256: 3a92643f3439f48a0cb9493ab1fbeef951fd4ed10c7484815f8fbaba14ea1aec

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