Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e796f80c4ce1f0…

MALICIOUS

PDF

34.1 KB Created: 2020-11-04 21:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ea819722589b6f510fbf3d0d7d9a9ea3 SHA-1: 7f94837bb992c1232c0abec693dff0f28f955d59 SHA-256: 92e796f80c4ce1f050c5e602d601da5df399081f217b6dbf2c3d23f487b849e4
174 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the malformed stream length suggests an attempt to exploit PDF parsing vulnerabilities. The document body and embedded links suggest a lure to download further malicious content or phish for information.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=d+and+d+monster+manual+pdf+5e In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/2691997.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/lazekazatulemofun.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/d3e1a4ef-cff2-4057-991f-cb3c053c9823/90137467747.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/fixivunowalekifalugivezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445a2270-6243-46d8-9f07-7e59a3f6a302/rixikoxuvit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e4450e-be7e-46c2-9b39-8e9b03594f19/zebifofamarizalok.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/mitikezeziwoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f70cca2a-0f3b-408a-bd49-3f9056e71e54/jolula.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/80866148562.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/scammer_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9164e825-6113-4b94-98de-495266ce2562/transportation_ap_human_geography_definitions.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/post_traumatic_slave_syndrome_study_guide.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_off0000468d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x468D 5308 bytes
SHA-256: aa1b3ac7dfc1522f68e9d572eb790efe02b6d03a417ac474016b2f8809cfecce
font_01_sfnt_off0000588c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x588C 10244 bytes
SHA-256: b43507dfcbf7d68d91602d721be7633a302f9ad5f5999ab3f9de3182740bf066

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