Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31f8f17483d9aaa…

MALICIOUS

PDF

51.2 KB Created: 2020-10-26 05:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ddb0cb450ae7850ef35cc594341371a6 SHA-1: dfc2d206bc7b7520d04fa48c5a86e6285768f891 SHA-256: f31f8f17483d9aaabfd672f30fbaf98ae4b7a45490ec0ed9b64a1e68dd03c71f
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://cctraff.ru/pify?keyword=assassin%2527s+creed+game+apk+for+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f9326108924b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_5f950c2d4a6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f89cd5b04521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2159/7333/files/68771634056.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1518/4295/files/prophetic_declaration_prayers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1370/8182/files/bixenibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8892/7647/files/download_tabel_durbin_watson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/2nd_century_bc_greece.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/80973639829.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7482/8953/files/32247036962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bf4e6d-6ef1-464d-83e6-c679cdc18e35/the_slight_edge_jeff_olson_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e541b636-256d-46f8-872b-43edd4fe302f/bdo_wealth_ranking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee64940-97ae-43d1-b3b8-7bad682b5694/81683169515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b0c12c-d612-4263-b311-ab2eacbe0157/85913508723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d661152a-1e5b-4793-a329-a1b76690753d/49395372445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc259c88-0628-4f4c-be09-ed7cfd85cbfb/car_drivers_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d6a8d6-f48f-4581-ae86-9deb341e0967/75969093604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/chest_guidelines_vte_prophylaxis_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4495/4527/files/computer_hardware_course_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/helix_jump_mod_apk_god_mode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1436/3557/files/23241626862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2715/9448/files/dp_airgometer_user_manual.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_off00007ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA2 5240 bytes
SHA-256: 2ea0f6349d0eb6b21b36590da758a5120d65730ae29307948b79a873b7c2bf38
font_01_sfnt_off00008d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4E 10464 bytes
SHA-256: 1ca0138713c58e5eb8d47e33601a8178fa36e0fa3cf8438b50d4bcdaa4d0676e
font_02_sfnt_off0000b106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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