Malicious PDF — malware analysis report

Static analysis result for SHA-256 065e948d91e2502b…

MALICIOUS

PDF

37.8 KB Created: 2020-11-04 22:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d8a44385d98bde9b4fc89c23bd7cf832 SHA-1: bba39feafd586ad10518df07370f735317372025 SHA-256: 065e948d91e2502b27e2c5601094bfff9f54e876fd71908fd312252221567512
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 embedded links, many of which point to redirector domains like 'ttraff.ru'. These links are presented as educational materials, likely to trick users into clicking them. The ML classifier strongly indicated maliciousness, and the presence of redirector links suggests an attempt to deliver a secondary payload or phish for credentials.

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://ttraff.ru/123?keyword=planet+earth+ice+worlds+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f87424e4805b.pdfIn PDF document text
    • https://serabonileraso.weebly.com/uploads/1/3/4/4/134444783/fenakonoxovu-gawig-domegowaninosew-xurerami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f87708c80f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_5fa2e80d25882.pdfIn PDF document text
    • https://vufizirisabewi.weebly.com/uploads/1/3/4/4/134443644/tavig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f8b936a5b317.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/fejenijovekozu/all_about_upsc_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/43600402167.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/annotate_program.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/wabotilakozowa.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/mefuxuvuzuved.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/jivadozodimisamajo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/advocare_24_day_challenge.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/3731580476.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_off000053af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53AF 5184 bytes
SHA-256: 8d71d947a03319fe3930eb9bb5a4fbfb303f69399a74abb9f238d32be4aae339
font_01_sfnt_off00006559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 10916 bytes
SHA-256: 2c2b2bca276b19e0524fb3ef310cadbb95ecb98260e86d1fb78bd2174b97efce

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