Malicious PDF — malware analysis report

Static analysis result for SHA-256 a067e36091222561…

MALICIOUS

PDF

41.6 KB Created: 2020-11-08 14:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 56237a777159d8f7c70d9b3aee505b41 SHA-1: d98efbdcb0e5189c329256fd3dd021fcd565e821 SHA-256: a067e36091222561b0169eb19c49be843758a6b3f70dc69f0c6f85ba95459452
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to drive traffic to external sites. The embedded URL 'https://traffking.ru/aws?keyword=marriage+is+a+private+affair+by+chinua+achebe' is a primary indicator of this malicious 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://traffking.ru/aws?keyword=marriage+is+a+private+affair+by+chinua+achebe In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8c492a7318f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5f8ecd0e26f01.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/mijepetuxuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_5fa7333c85ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f92af1d69e64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5f9783f3c3621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f8d40a224e08.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/judebinofanoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5f98ff39e3bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f8b3d3a009b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5f994086c9d05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dorulusof/talav.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/98316249731.pdfIn PDF document text
    • https://tirutijupez.files.wordpress.com/2020/11/kobogapofadusadi.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.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_off00006298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 5552 bytes
SHA-256: 2e13a694ef0f36b79d664954ef4c64cf70939adb0b813f3dafb79084a538489c
font_01_sfnt_off00007598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7598 11060 bytes
SHA-256: b4b8d6dad2d5247657b2bc1c4e17ee87f2de0a9012488959ca72072053ad82d8

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