Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4ea24285d58cc6…

MALICIOUS

PDF

38.4 KB Created: 2020-11-03 00:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5889b02620ef744c2f85ec7d7b8470a7 SHA-1: 53165df44a2dc11d906d268f37984c32967c7298 SHA-256: 7a4ea24285d58cc693e4b5fd483b64049e9f8b9610050b46c9654ddb5deb0c9e
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a user manual. The heuristic firings indicate this PDF is part of a link farm, likely designed to distribute malware or phish for credentials. Although no scripts were directly extracted, the embedded links and the nature of the heuristics suggest a malicious workflow aimed at redirecting the user to a harmful site.

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.
  • 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://gettraff.ru/strik?keyword=user+manual+for+accu+chek+aviva In PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/4738669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5f9ea6c94374d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f870fc435a6b.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/nupotukig/nonfiction_reading_comprehension_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/colon_and_semicolon_usage_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0385/3981/files/apk_to_watch_free_movies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1955/2926/files/zomugofawatolaraji.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/89893284090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8039/3900/files/android_toggle_button_onclick_example.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/pampers_underjams_xl.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7A 5040 bytes
SHA-256: f105ca6867605986d01f30da5b76157c6771c071402a14a5a29d285bf31ea1a7
font_01_sfnt_off00005c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6E 10136 bytes
SHA-256: c2c9b1aed01e552f5ca7347db4f0b6f6bae915dc5bd4b70564bfb86ac07fcb3e
font_02_sfnt_off00007eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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