Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ed47717607faea…

MALICIOUS

PDF

38.7 KB Created: 2020-09-30 15:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 454c637584b252f75fda9f782de3aec3 SHA-1: 5204ad94acb5b7344b0eaada5370f6745949bf79 SHA-256: 90ed47717607faeab68c5217a1f6256b95142adc66afd00a8f0aa0a60e1885a9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users searching for academic materials. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for phishing or malware distribution.

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://ggtraff.ru/strik?keyword=fundamentals+of+electrical+engineering+nptel+pdf In PDF document text
    • http://digadil.instajeepthing.com/uploads/1/3/1/1/131164250/1494162.pdfIn PDF document text
    • http://files.twhstheater.com/uploads/1/3/0/8/130813524/5976639.pdfIn PDF document text
    • http://files.cervantesprimary.com.au/uploads/1/3/0/8/130874639/ce3ac340ea7275.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/5d973545-790f-4c15-9920-0c7ec1270d90/zutugaguloluwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6742ddf6-60cf-44db-b02c-6853aaca97d7/97997783957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8170ff2c-8ea2-4b4a-9641-bf5c6f26b2a8/77492442455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468d09c5-4aa3-458d-99a1-5ccadb842d53/45561790665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3b0573-a5bf-4935-abc0-91c528a696f2/gusufivunizoripi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88ce28e-6461-4110-b9a2-7218fc5ada6a/betaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fb96ce-6ca1-4ba4-8039-7bb81fafb8b8/82669965302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1789d109-c087-4b26-a55e-b8f747d2e0cb/90098276843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d961ad47-c177-4409-ad29-ea1cc40c71fa/37914805555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7931538-5701-4e3a-9bf4-d39416949f5d/zuwajekober.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d0c46b-46cc-4452-a926-fb583566ac56/noxasegewuzepomogeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb66f02-eee2-446e-862b-e2d71f4856c9/xotemelavovaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9765e86c-7cac-4d9c-8ca9-76aa93ba4ca3/79679887493.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_off000059bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59BF 5432 bytes
SHA-256: 7ac0b888badf70ebc36adce04c0f39674ff5aa6e1f422c1ae2f42d4b4dbe3b14
font_01_sfnt_off00006c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C26 9880 bytes
SHA-256: 02a1830996305844b015fe9ea71c06f56a2d500f0ad6aa1e91e00970d35d95d5

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