Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8f2cb72c2cba99…

MALICIOUS

PDF

73.7 KB Created: 2020-12-18 10:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c644b6b5afe21021c3b56c2cb8f2879 SHA-1: baf573db839abb3515d18e7159e82811229ee511 SHA-256: 9b8f2cb72c2cba993d147044a1d8016fedcfea3050f44fb881c6aeb6db13a04b
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to direct users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external links suggests a phishing or content-farming attack. The document body is heavily corrupted, preventing analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/123?utm_term=como+se+traduce+paperas+en+ingles
    • https://cdn-cms.f-static.net/uploads/4485930/normal_5fba012271c13.pdf
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/zajasoguzen.pdf
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f8fba1c2cedf.pdf
    • https://fupesovuzej.weebly.com/uploads/1/3/4/0/134016868/a859cc.pdf
    • https://cdn-cms.f-static.net/uploads/4415543/normal_5fa3b4902e7c8.pdf
    • https://cdn-cms.f-static.net/uploads/4420438/normal_5f9e94eb17df1.pdf
    • https://cdn-cms.f-static.net/uploads/4421038/normal_5fb2bbb7d3021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d45d8d6c-c14d-4a94-a013-0897ea1042a1/nordictrack_t5.3_treadmill_price.pdf
    • https://uploads.strikinglycdn.com/files/af86bf44-4110-4365-9331-42d19545eb68/faluxoleloxeramodovefaleb.pdf
    • https://uploads.strikinglycdn.com/files/ca7a6d77-a9c1-4cd0-819d-f0eafcc90b0a/89445073176.pdf
    • https://uploads.strikinglycdn.com/files/57dc3c6a-7b8f-4b4e-adec-c2b17c210246/99110914549.pdf
    • https://static1.squarespace.com/static/5fc0c162085bf90c0efc5341/t/5fc8b736d32d012678005bcb/1606989623751/voloruvij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3dd.bin
e78ac4fde744172cdc1e761c28779cebdbafd156f52f432f94e729e8ffda5d45
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 5300 bytes
font_01_sfnt_off0000e5c8.bin
48030ec585b96113f6f04fa22db97bf11cba8ca3cc86d380cb74759cad720b63
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 11232 bytes
font_02_sfnt_off00010a60.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 4324 bytes