Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6b2a9495975a81…

MALICIOUS

PDF

49.3 KB Created: 2020-11-02 21:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f403e05a6600e79c1b6f152238f5141d SHA-1: d7b5315025d8ae2a96fe80060ad5b934f306a5f7 SHA-256: 0a6b2a9495975a819b2b20dd72d7433b55169e02dbe72f782abb18cd5574d7c2
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector infrastructure, which is a common technique for distributing malware or leading users to phishing sites. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm designed to attract traffic. The embedded URL 'https://cctraff.ru/aws?keyword=garena+free+fire+mod+apk+android+1' is a primary indicator of the malicious redirection attempt.

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/aws?keyword=garena+free+fire+mod+apk+android+1 In PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/6091186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_5f94bb138ce1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f9bc27bb3b5c.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/jakujakula/96799068285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1328/2213/files/lutijoxeko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1596/8172/files/annihilation_of_caste_essay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6262/9030/files/descargar_anomaly_2_para_android_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3492/3957/files/44806169815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6076/1254/files/memobutigerefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7732/9579/files/65321887373.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/search_inside_yourself_chade_meng_tan.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_off00008105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8105 5124 bytes
SHA-256: 99ed60bcb956b8c8f2291d4f464735d9e88d1deb911906a92f0f13fe9c94bd13
font_01_sfnt_off0000926e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x926E 11140 bytes
SHA-256: 8ae2df47166872ffdf0aeb37e96599e3fce7aea06794c610e7643fef36ea1413

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