Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e733df886baaec…

MALICIOUS

PDF

40.0 KB Created: 2020-11-09 05:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 451989bf459c731e6f1a83d6b71c135d SHA-1: 1e008e7ceaf88749f253b38d544643ea666d13b5 SHA-256: c8e733df886baaec81e6b9f739a490739d62feb03712a78de75ef706e2c9a89c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, a common tactic for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a high likelihood of malicious intent. The embedded URL 'https://traffnew.ru/123?keyword=dst+file+format+converter+for+embroidery' suggests a lure related to file conversion, likely to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?keyword=dst+file+format+converter+for+embroidery PDF link annotation
    • https://lixabexuraluna.weebly.com/uploads/1/3/4/2/134234562/ruselugapalupazut.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/mekezazuboboru_pasazaw_zigexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f991401c988d.pdfIn PDF document text
    • https://woruvewuz.weebly.com/uploads/1/3/4/4/134400058/nezejimin.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/bd8ac659-9ffc-4841-ae6a-62e603bea857/fesidafajibo.pdfIn PDF document text
    • https://gozagatu.files.wordpress.com/2020/11/xuparijina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b93d727-22b6-4b51-a760-e4d68c83fa85/imp_of_the_mind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e476bd4-9be0-407b-a9c4-e6d8a3465661/xatozimikaziz.pdfIn PDF document text
    • https://fazojikimugu656942302.files.wordpress.com/2020/11/cognates_hebrew_english_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26dd1396-1916-47c7-8fef-ff71d9679f49/77464099350.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_off00005fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAE 5468 bytes
SHA-256: db66b62ad53299e2da26d702071062ce90d28771f20f924cce8fdd4349c8b48f
font_01_sfnt_off0000723c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723C 9864 bytes
SHA-256: c0f9b771933990db0260ec9cf04476fb7d48bb0244fd332104cae8949ee0b674