Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48f63d691e78f02…

MALICIOUS

PDF

36.4 KB Created: 2020-10-29 21:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 67181ac75c36390ab43667bb45ff424b SHA-1: 80e8d19b8f0ea45a2d4b7fd59abce7d30df21e38 SHA-256: d48f63d691e78f02196e2e328afb0ad828e6616356e3ad5687ce368b48ebfc7f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to external PDF files, and one specifically to a redirector URL associated with malicious activity. The document body, though partially garbled, contains text related to a book title and a URL, suggesting a lure to disguise the malicious links. The presence of a malicious redirector link and a large number of external links strongly indicates a phishing or malware distribution attempt.

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://ttraff.cc/123?keyword=about+face+the+essentials+of+interaction+design+4th+edition+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_5f96243b8ca7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5f92a1bd77b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f8c3f7294985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5f9a49c1d2ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f8749a7cb032.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/munedivuwalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f915aaecc253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f873c0abcf34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427499/normal_5f99302d8264c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5f966f2376a97.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/0fc92a06-3752-490a-8a41-e4b45b338758/sadawekiwiruvivivof.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_off00004d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D7A 5724 bytes
SHA-256: d241c21c98d94ea56f53f6ddb0e3adbf37cf55072680e4333cb1b572d87a76ca
font_01_sfnt_off00006105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6105 10452 bytes
SHA-256: a90845353a8d6f700f60845473b93a211926a649b6f4dc95528e05b06e58e511

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