Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e5f5dafb002c8d…

MALICIOUS

PDF

45.5 KB Created: 2020-11-04 10:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: deb4ed064b801fd2d5d8d303c22006d3 SHA-1: 854198ce995aadeeb4f75a8067cbf252f47920bc SHA-256: c0e5f5dafb002c8dc60a6c4ed357eb45d453a4d8177774aded6a5cd76cd48e01
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a redirector link to `https://cctraff.ru/strik?keyword=summary+of+nothing+but+the+truth+by+avi`. Another heuristic flags a large number of external PDF links, suggesting a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=summary+of+nothing+but+the+truth+by+avi In PDF document text
    • https://zelidewa.weebly.com/uploads/1/3/4/3/134371532/ditogebup.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/bumil_xoretij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_5f9112a78b53e.pdfIn PDF document text
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/bda307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_5f9bebf3d19c0.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/c975a090c8.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/tuxutedi/labeled_red_blood_cell_ks3.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/gimajiluvuvifibilijebim.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/is_kno3_ionic_or_covalent.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/gudiresipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7744/4790/files/tech_21_trademark_60_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/73819912647.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/critical_thinking_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5002/7176/files/72365539477.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_off0000717a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x717A 5376 bytes
SHA-256: 05393fa2617d7492aacea4b3b520ef7855bd19607c5196be90838146b0208917
font_01_sfnt_off000083af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83AF 10876 bytes
SHA-256: 36b8ee951dba96bb829e2b153635a09edbf715753d6d38decee33c7f71b00023

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