Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbff55d855c6ccc…

MALICIOUS

PDF

44.2 KB Created: 2020-11-09 01:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 01f093e0472a07e48ec0a0d2ef213a91 SHA-1: eae3bc254e4b76f18f02ebd614c41da2a91763e5 SHA-256: 5cbff55d855c6cccb9d35c63cadb28f99c651405449ccb28608980025f2af790
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ggtraff.ru), and another to a large list of PDFs hosted on S3 buckets, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ggtraff.ru/123?keyword=final+verdicts+the+crucible+answers, which is also identified as a malicious redirector. This indicates the PDF is designed to redirect users to malicious content, likely for downloading further payloads.

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/123?keyword=final+verdicts+the+crucible+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f8c45c0c1979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f8889f11b229.pdfIn PDF document text
    • https://penepanixefi.weebly.com/uploads/1/3/4/3/134354239/gosukoperexupimuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_5fa10ed2c44f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_5fa1416b7f22e.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/kegule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_5fa6519b76abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f94bb4e4419b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fojaxexino/dibukuweruzif.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/kopatiboraragoxib.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/23178926211.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/xebixoxudozomun.pdfIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://gojifededub.files.wordpress.com/2020/11/pifusefoxidusoju.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 8

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_off0000632d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632D 5048 bytes
SHA-256: fd5db78760a1a2c030df8dd382d8f8cbb0ee0c2887077bdc808cb03c4cf5040c
font_01_sfnt_off00007451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7451 9840 bytes
SHA-256: 8de7fdd1a4c670654074c0af791a134fb3986718f18330283dfd4a12b12ab341
font_02_sfnt_off000095e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95E6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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