Malicious PDF — malware analysis report

Static analysis result for SHA-256 925f19d72ebc87a2…

MALICIOUS

PDF

44.0 KB Created: 2020-10-28 01:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4cd0df8ea7e1c412d8db62768b1c53f1 SHA-1: 180c668657f222cc3181b7dbcd769f16de9bcd14 SHA-256: 925f19d72ebc87a2ac472578063903b425e9ab7c455564dd182b8f35dc6a2343
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links directs to a known malicious redirector URL. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the primary malicious URL.

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://gettraff.ru/strik?keyword=clip+on+lights+for+glasses In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f98a82de68c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f90d0d28dea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f9194e3dc6ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5f9496f376f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f986990de133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5f9420dc1eb11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/empress_persona_5_weakness.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0780/2518/files/teaching_synthetic_phonics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9560/3862/files/37803719397.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9599/3754/files/noponusukusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2315/7416/files/picsart_unlocked_apk_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/94350256628.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/69471567327.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/zeleteko.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/livukesunozisogulegef.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/5689614062.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/assessment_center_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/30196392245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2931/8813/files/77689064580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/xawekevikozib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2740/6241/files/black_forest_trifle_pampered_chef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/9083266396.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_off00006a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A86 5068 bytes
SHA-256: 1c05d0ae2974f15477ebfa574bde00b79ac96a71900c55100bc817a12dd407c6
font_01_sfnt_off00007bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB9 11932 bytes
SHA-256: bf37c2d4bc5d213a5ccabb948b003aadd5086d1e0eaa7b5490b52ee0ca2896af

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