Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d160e5640a8ced…

MALICIOUS

PDF

84.1 KB Created: 2020-10-28 08:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 098172e360d0cf3991d8bd9f1f9c9f67 SHA-1: 7279918613b2ea9c70b63d9923f468c780c7f83e SHA-256: c9d160e5640a8ced28f642e862b2a95e4fa4c1773f8fc24c796b2613e8dc5113
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identified a large link farm, suggesting the PDF's primary purpose is to drive traffic to SEO-spam or potentially malicious sites. While no scripts were extracted, the sheer volume and nature of the links point towards a malicious intent to redirect users.

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://ttraff.me/123?keyword=all+parts+of+sunglasses
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/908933d8856.pdf
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/resutefi-koximefunapej-wodovawun.pdf
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/zawozusajabak_xoxovuniguvitiv_galiguru_nizigumujuvamo.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f88594917a45.pdf
    • https://cdn-cms.f-static.net/uploads/4401983/normal_5f98049e1764b.pdf
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5f91310619996.pdf
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5f904d53452e3.pdf
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/4420607.pdf
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/momuvevodotanep.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/bikimuber_zamiwidigoled_tofazixawe_zerujoxived.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/90030ca7-d700-4fc0-80d7-b97503b1a8e9/4684417483.pdf
    • https://uploads.strikinglycdn.com/files/ccb86264-1248-4b42-857e-5d30b46a1bdf/19574231465.pdf
    • https://uploads.strikinglycdn.com/files/d0d9f066-eee7-4c05-b286-0b06cc430dfc/edward_said_culture_and_imperialism_chapter_2_summary.pdf
    • https://uploads.strikinglycdn.com/files/c64cd04b-dad8-46fd-be64-9a0d83a25af7/59620239827.pdf
    • https://s3.amazonaws.com/gofilafixu/45858147790.pdf
    • https://s3.amazonaws.com/zuxadol/83372995479.pdf
    • https://uploads.strikinglycdn.com/files/5849f067-87d1-456e-9d25-5e77f566e241/29061162167.pdf
    • https://uploads.strikinglycdn.com/files/1a0884f3-31ff-4655-b953-01041c3f7cbe/58814677524.pdf
    • https://uploads.strikinglycdn.com/files/eae426a1-ac3f-46fe-880e-86f94b72d159/6873170062.pdf
    • https://uploads.strikinglycdn.com/files/34795f83-0644-443d-a316-d563744a18fa/43158522793.pdf
    • https://uploads.strikinglycdn.com/files/2dbb7ed0-047e-450d-b873-551b1eee7cb2/60460259520.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_off00010676.bin
8a4ac26c7d1005379657233c6753c4cc8874ffd7ae3602334be45cab953e4b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 5056 bytes
font_01_sfnt_off000117b9.bin
23495626240bf95b6d4e118e45e33e79717af41b6fb6a735cec9c1be7b41a9b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 13724 bytes

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