Malicious PDF — malware analysis report

Static analysis result for SHA-256 0effeded5cc4afc7…

MALICIOUS

PDF

45.8 KB Created: 2020-10-30 23:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 514a6da7977d7de573f6cd163abc01df SHA-1: 30e37f49117d936881ac65808a8c79b9b4906548 SHA-256: 0effeded5cc4afc7bafdfb6d0e092c738ad96d87949843684d262fbba1974ea6
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a college recommendation letter sample. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing page or further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=parent+recommendation+letter+for+college+sample In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5f93022c5b107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f91a0da71fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f88949f10471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f88ac2ed301e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_5f968b3c41ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f927d03491c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5f96f9f36fba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_5f97984132608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5f928c28a7bcf.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/dfac564c-5883-4b3d-a16c-c7031802cb84/sudewemixigowobenefubamik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd93dee3-5f24-42d0-8e4f-ee5d94f1538c/11185983853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a04460f-f891-4369-ba68-59f49209e25b/how_to_open_pak_files.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c478a7c0-6492-4f8b-91bc-1fe4d3fb2b8e/the_fall_albert_camus_indonesia.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_off00007440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7440 5476 bytes
SHA-256: 572362302d4230cc2ee0e4cadf2987bfe47f03d295e01da898c059570e0659cf
font_01_sfnt_off000086cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86CD 10424 bytes
SHA-256: 9ded1da258b05f9d7d8ffdb4f54fec2f7c5d37ae0f34b2ad1fcf80b1fd82b32c

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