Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05cc899ad1880e0…

MALICIOUS

PDF

46.2 KB Created: 2020-10-30 16:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b44fbd3f66f51d470e62b7e2ded885a7 SHA-1: ba3e80943c5dfdfe75b186ebe7ec4ad6e9251f0c SHA-256: a05cc899ad1880e03f4906515e4db4e6c011e204179b7dc777467de739ecec5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier also flagged the document with high confidence. The primary attack pattern involves directing users to potentially harmful external sites, likely for further exploitation or phishing. No scripts were extracted, and the document body was heavily obfuscated, limiting deeper analysis of intent beyond link redirection.

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://gettraff.ru/aws?keyword=biologia+celular+y+molecular+karp In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f8846a08e929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f925ef49e5c9.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/kovisemifarigugufol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f8b38380acf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5f957fff1e886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f8c6847a568c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5f93e9abe7417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f946b9244eb3.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/2f6d0609d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f8ac0d5a28ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/326dc0a2-cf58-40bf-828f-f75770ec1ad1/she_kills_monsters_full_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c32e4c-5d59-4b10-bdd9-b912a4a65c5a/titonaludegivirajakev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36dbf2b1-e624-4e4c-876c-03aade6cf4c5/dujufezonagonikeninegez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c4a5a6d-8931-4e0e-b93a-98349dc043ac/gakijurujuwanuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9a93c8-cf07-4f52-804e-895c425043dc/8257967543.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6640 4988 bytes
SHA-256: 6d274f845d31933eb0d6d4d9af8e49c1fff143d6d6734056c410303474f575c0
font_01_sfnt_off0000773b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x773B 11832 bytes
SHA-256: 70e313e1cca9b2b8aab30ccb5721b672bd93d4e82a5d5457de296a518e6ef4b3
font_02_sfnt_off00009dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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