Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bc9969c933578c…

MALICIOUS

PDF

47.5 KB Created: 2020-10-27 19:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02b25789405f89e1b0d1cf2a3e0f6e20 SHA-1: 5e7210008f7f76359d7cff069997b06df4855462 SHA-256: 41bc9969c933578c37747e75029747176a18f8d9b8edf507448dea76886587f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains the target URL and appears to be a lure. The ML classifier also strongly flagged this PDF as malicious.

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/strik?keyword=madison+streets+recycling
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f89413fe161e.pdf
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f8819dededa9.pdf
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f8d1125399f6.pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f8d442d75e16.pdf
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f886405e7469.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f8d53ad8e61f.pdf
    • https://cdn-cms.f-static.net/uploads/4371807/normal_5f898b27232e2.pdf
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5f9056c119cdd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/40bf6751-26f0-4268-956e-079b69adb955/53843159471.pdf
    • https://uploads.strikinglycdn.com/files/01b13f5d-c5c4-4c38-ad24-bb8082fac241/64093637459.pdf
    • https://uploads.strikinglycdn.com/files/65619ed6-50e2-4073-a153-1f0ee96c76d3/43552078499.pdf
    • https://uploads.strikinglycdn.com/files/c5b81d7b-caf3-4a9a-8deb-f976c10d8b69/wezabeme.pdf
    • https://uploads.strikinglycdn.com/files/424c86b5-e920-4959-87cd-64021c4331d3/votatudisezekenowovifo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/27986659297.pdf
    • https://cdn.shopify.com/s/files/1/0492/0587/0758/files/politica_de_almacenamiento_externo_android_4.4.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/52838965336.pdf
    • https://cdn.shopify.com/s/files/1/0485/3632/2203/files/download_fieldrunners_1_for_android.pdf
    • https://uploads.strikinglycdn.com/files/b0d55fc6-6290-49dd-b6b4-6300b16b8133/rigig.pdf
    • https://uploads.strikinglycdn.com/files/564bf4f0-d617-4119-8406-ce466fa91b14/91760380808.pdf
    • https://uploads.strikinglycdn.com/files/78b7e2ad-c72d-4e48-9844-e38073f11f92/38570340344.pdf
    • https://uploads.strikinglycdn.com/files/6a903330-7182-4bf0-aaa2-409c36864458/21199681214.pdf
    • https://uploads.strikinglycdn.com/files/9b4ba640-9d78-4ddd-b933-eced70e15b37/doforivoregow.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/nebraska_soccer_league_field_status.pdf
    • https://cdn.shopify.com/s/files/1/0496/2238/4793/files/american_express_merchant_financing.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e38.bin
b86afd1e7287ea10581bd26af7a55f0734597de88a94c9d5e933ee08ca4dcc27
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E38 3080 bytes
font_01_sfnt_off00007939.bin
90fec63de57bd3dfe270712a97066f17a518f10c56741e810180b6fbf8058a72
pdf-font-stream PDF embedded font (sfnt) at offset 0x7939 5216 bytes
font_02_sfnt_off00008b09.bin
cac48b2fde1d81c87b49cf17480fb56914faff7a8fd9495e2701d943d4da2ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B09 11172 bytes