Malicious PDF — malware analysis report

Static analysis result for SHA-256 619b624fe594e91c…

MALICIOUS

PDF

44.5 KB Created: 2020-10-30 12:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1e0609b62937bda02db26b1467f4554 SHA-1: 9f6b0cb8b38a5e6f471b7216aba3d98239d12f46 SHA-256: 619b624fe594e91cae52e17e5b3ee0189b7c500c963656fa6dcccd885b27c387
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains a URL that matches the malicious redirector. This suggests the primary goal is to redirect the user to malicious sites, likely for malware distribution or phishing, leveraging SEO link farming techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.ru/123?keyword=showbox+apk+ios+2018
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5f984142288c2.pdf
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/6954211.pdf
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5f8e3d1b83857.pdf
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f871cbf582ea.pdf
    • https://dubuzimonovox.weebly.com/uploads/1/3/4/3/134347386/zewubosa.pdf
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/pulijokitenomulu.pdf
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/cf3e6d.pdf
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/6036241.pdf
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/regeseg.pdf
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/e0431255f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donake/apgar_2016.pdf
    • https://uploads.strikinglycdn.com/files/737604b2-39df-4ea2-be87-bb0d7885e2c8/56907210753.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cfe.bin
4d5c787c41fd8c25d65d0738ce2486173d82fbb33bde26445d6fe9433cc81d53
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFE 5768 bytes
font_01_sfnt_off000080b9.bin
8691e9825452279c53ace180305fbc65638f241d5d32bc3c299f461461d27a82
pdf-font-stream PDF embedded font (sfnt) at offset 0x80B9 10692 bytes