Malicious PDF — malware analysis report

Static analysis result for SHA-256 701db41c8121b9c7…

MALICIOUS

PDF

38.0 KB Created: 2020-10-26 03:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9ec652c7434a4ad53c987d7283e1ddde SHA-1: d85061b28132789d7f085e922b75937edf97a3b0 SHA-256: 701db41c8121b9c7469376efd33e4d456dc56b632e90e404f04d83bed8d5bf2b
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gundam+assault+survive+english+patch In PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/kegebeti.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/zopifoxeke-sorepopunilosiz-vumapetewi-vedonewogofako.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/22555.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/203aa7b9-fb9e-4a93-90c2-c64f82949a0f/gta_5_download_apk_without_verification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4589517f-9b0a-4beb-9937-7aa510b0da91/diganopularolubaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877c97c9-5307-4fe3-92c8-c6fa8c0f429b/19859619893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340c928c-580e-46dd-ae67-d6aef8ac303a/bayesian_statistics_the_fun_way.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce364d5-8325-409c-a797-5461386c0d47/25021427201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc57897e-e88e-45f8-97f2-eb9165069a19/91010733775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a81e7d-e799-45f8-82de-a2393785e117/science_of_creature_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58a1fa4-9bb2-4e7d-9f7d-0bceca7b3bb2/53271113321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5b05b1-457e-417d-ab01-52781a924dc8/87194174649.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3576/9012/files/15328483462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0752/7077/files/gurgaon_metro_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/jurnal_strongyloides_stercoralis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9493/8271/files/75111439346.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000499a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x499A 3236 bytes
SHA-256: eb5635296af7ab41edf8f94c7f6541ab4ef8a555669f99e7b903581b44a070b3
font_01_sfnt_off0000553f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553F 5576 bytes
SHA-256: 6e6e792ceb98303e3bebe69c07caf9ad8a9b0f2d7f35744443e741bf2b48245d
font_02_sfnt_off00006813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6813 10056 bytes
SHA-256: b18d3e2bade63faea0a87694b4599f80f32e5ad1b322f6bb7b21ac906cfd3007

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