Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e274c4a357567dc…

MALICIOUS

PDF

50.8 KB Created: 2020-10-29 05:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 16f3d9ee1ba3477724705ef741baf67a SHA-1: 9f6a97d69aa27f033e2e4694c6e0b696bb7a2967 SHA-256: 5e274c4a357567dc1148c264dcbf7cbd35ea585427685abd47ced90b41114d84
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 known malicious redirector infrastructure. The document body and embedded links suggest a lure related to educational content, likely to trick users into visiting malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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://cctraff.ru/aws?keyword=the+history+of+the+periodic+table+video+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5f969de6179aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8f48c2652d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f89762e9bcd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5f97a599b8048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_5f947ac885f5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f941bb0c2ecb.pdfIn PDF document text
    • https://jonowukamox.weebly.com/uploads/1/3/4/3/134372820/punikaf-kesabomuv.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/runavalekuluz.pdfIn PDF document text
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/tajapoparo_faxub_woguwobasubim_gifamuveda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_5f91c5ca6601e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5f98799367d5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f8b678392624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5f937d3774a51.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/79aca56bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f8bedc8b9bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8c7bd6a7324.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/2548ddb4-1bfc-44dc-96b5-53a2eeb96ed3/installing_hurricane_shutters_over_vinyl_siding.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2487/1335/files/susano_tank_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2393/9753/files/gmail_android_app_message_queued.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f683ee-f0df-4d23-8888-aac50b0d98e8/black_shuffler_gamefowl_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8077/6363/files/28411633951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/boxisepofezamapowodebisup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236ef8a5-f4f1-4d33-bdd0-8778314606e7/woxulagufajevulilive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b053278-b68d-4aa2-b0a7-4fa0689852de/xagajifatobovenukovap.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_off0000842d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842D 5652 bytes
SHA-256: 5fa3e511dc35b172f3d260645394b8c37b3d48ee7258660d1f8b86d811bef433
font_01_sfnt_off00009773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9773 11196 bytes
SHA-256: eb4404f82e54eb3984d5e3b7471d69533a9a501edd742c33d09c7650b94733c9

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