Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed5caad1a39a3d1…

MALICIOUS

PDF

39.3 KB Created: 2020-10-02 10:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0f172a3cf802052d834dcc8188db97a0 SHA-1: f612c4f95d6695b2db2676ae19c7a0960ee04a84 SHA-256: 2ed5caad1a39a3d178d31155fd2abfda53dab66678c515ab6a7598ad30e3c351
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for malicious redirector links, specifically pointing to 'https://cctraff.ru/strik?keyword=mad+libs+book+pdf'. This URL is identified as a known malicious redirector. The document also exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are benign Shopify URLs, but the primary malicious link is clearly identified. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=mad+libs+book+pdf In PDF document text
    • http://files.artbydodie.com/uploads/1/3/1/8/131872149/gosivivebarixagoj.pdfIn PDF document text
    • http://fusidup.authorkimberlymowery.com/uploads/1/3/0/7/130740356/4032596.pdfIn PDF document text
    • http://rawafe.cristinamigliorini.com/uploads/1/3/1/1/131164573/rukelixapimajapis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/game_of_thrones_season_3_episode_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9719/7206/files/4126472202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/4291/2673/files/damakogegadapakis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5164/1749/files/87256133366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1520/0158/files/museum_of_latin_american_art.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3191/5427/files/g_melodic_minor_scale_descending.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/degovetenuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e90a4c-3fa1-45e2-9ad2-642b00640bed/mabugixixine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf25d38f-ca0c-4b40-a31f-091b54cd3e46/83219048171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd6b4c0-ccbe-44cc-8af7-1d2869ef24af/xezidezokatamim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a69e6b-5949-460b-9988-70899fc8f802/fajotigedajusede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a624a3-71d8-42c5-a869-74e0313f119a/99830793811.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_off00005c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C81 5148 bytes
SHA-256: acc76d33fe62b2a529b84fe5ac1687d3d74bb042c86f2f723106674e49cd79af
font_01_sfnt_off00006e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1F 9964 bytes
SHA-256: f6c3dc73ec1dd38262c693bdf19d692d7e55a8ca99698d8d0aed30f4a0a1dadc

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