Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60644562a990431…

MALICIOUS

PDF

50.2 KB Created: 2020-10-28 03:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 86e8f69f3ed1db0691a83d377df3e6d8 SHA-1: 93c8f00b069e5081e0fb10b8ac418fade5d36e5b SHA-256: d60644562a990431f39b4a41b6a6a622f00bc99b9ec847e9ba1b3c8b0c799171
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The SE_CLICKFIX heuristic indicates social engineering to trick users into executing commands, suggesting a multi-stage attack. The ML classifier strongly flags this PDF as malicious.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=fortnite+stretched+resolutions+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5f96ffcf89aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_5f912a4d97602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5f96c4851dec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f889824ece48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f8df43eca847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_5f949fc0c15d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5f8fd8c569a77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9749bfb1-9e0d-4e46-b282-ba754b1b7230/49206495236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e28c94-39d0-46bd-bb59-d7a0c36d563c/kifaxubotil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0733a697-6e3e-4254-b497-2b10056c87e7/67847624108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6484210f-a303-406d-82d9-943dcf9bcdfb/81551222424.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/sounds_english_international_phonetic_alphabet.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/61913852328.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/black_s_law_dictionary_10th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/division_bacillariophyta.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/wubezamajatazusizejuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3160/8487/files/nudadonifup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8785/3720/files/zajoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1367/7471/files/5e_eye_of_vecna.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3838/7607/files/p3_the_answer_tips.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_off00008255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8255 5048 bytes
SHA-256: c3de3e59749012ab26605a4b9209e6e0977312ca54e1e2a6b006cc0991ab1715
font_01_sfnt_off00009379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9379 11712 bytes
SHA-256: c5d1c67c693981f3c922bcbc098c55a1ffcefe6505616fc1fdcfe4595f8e85b1

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