Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89827c626184e43…

MALICIOUS

PDF

41.2 KB Created: 2020-11-03 16:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2b783da9ac64c42840cbf760dbfec137 SHA-1: 1d97fe8041e3c9234ecac444b30b3e4063ba4aa6 SHA-256: f89827c626184e43ba19b29b531bf1448678221fb6bbf6f609a875dc7ea458ce
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting a phishing or scam attempt. The embedded URLs point to known malicious redirector infrastructure, likely intended to lead the user to download further malware. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/123?keyword=uno+iptv+download+for+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f926000c09f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5fa0e5efcc418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5f9b7ce1ba2d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5f95ea6218091.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/af04d84b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f9a86d1098ec.pdfIn PDF document text
    • https://tusefekojeseto.weebly.com/uploads/1/3/4/4/134437698/zesefiweberopubome.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/32eee4b9.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/luwowozikedazas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f88ecbe86583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f942b992672c.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/0255def3ca6f2.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/leguvefu/zifazilodanawuxuze.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_off000060eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 5112 bytes
SHA-256: df007ff0e7caaa1e377a062cd17fa362eb117a98a059bd646a51bd4e84c04242
font_01_sfnt_off00007283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7283 11316 bytes
SHA-256: 469cb6dcb2043923a3ea94ac65a82526c0037801a1a0fe902f56667fec9ca26f

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