Malicious PDF — malware analysis report

Static analysis result for SHA-256 3840eb486d39b5de…

MALICIOUS

PDF

48.4 KB Created: 2020-10-29 04:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0119a012e03c01f54a643dd5311a5bb7 SHA-1: d9cc7047d70e5faa95ef2798e99e00eabb3e886f SHA-256: 3840eb486d39b5deebd796f7b6b1fc7ada737d04f7c74d6bb003afc0f54d2d89
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=mathematics+vision+project+math+2 In 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/7cef311f-958c-450f-81d9-3382cbccdd83/96366043368.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8714/1300/files/ao_smith_electric_tankless_water_heater_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a82264-71a3-43d8-bd90-4642f05e21f7/jepuloduv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273d1628-0631-40c7-956e-737ea63a8b33/67125160715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5d9f6e-1a9f-4bf6-9886-df7b5564d0e1/getizevorobiluki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce32aa1e-ac95-43cd-9438-2def7533b8f4/carter_burwell_bella_s_lullaby.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/pijizosuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2731/2035/files/uttar_pradesh_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/1/0437/6051/7274/files/ragnarok_online_revo_classic_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f61973a-3f4c-4126-9069-470be2e1e083/zenadomu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/i_am_paul_walker_tv_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4189/7113/files/green_pond_water_fix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8521/5940/files/batman_the_killing_joke_graphic_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8f7ed6-534b-448a-a518-78cfe42f31d2/43827192022.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/pathophysiology_textbook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/relative_afferent_pupillary_defect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb62f12-c434-463d-ba73-23fdd8c3519c/36126886473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5f66e8-42d8-40fc-a0d1-96cedc5787b3/pmea_district_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842be8a3-8dc2-48b5-9889-d2af4c70c1e1/zatubunanupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8578b58-baca-449c-9542-7bb918bcf5a8/68839395582.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_off00007cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD8 5416 bytes
SHA-256: bb70e2474ade0ce5e53cb103e4a5b5723c5a18b012f580ff62c99c3dec199553
font_01_sfnt_off00008f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F32 10744 bytes
SHA-256: a6d155e22a450a4715e2d51264414e745db280385a805d545e8dd58d82e53e64

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