Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ae3aaefbb3fb35…

MALICIOUS

PDF

65.6 KB Created: 2020-10-30 08:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6618a1b790c3004c91e1f9458f96a44e SHA-1: de50faa7df17c24a2aa0bcc06c179e76f907ac62 SHA-256: 58ae3aaefbb3fb350c6eab0eb22a5b53a5283fbc63210d2789e20f6ae4fa608b
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://ggtraff.ru/123?keyword=mount+and+blade+warband+viking+conquest+guide In PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/db02a9c833f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5f8cb6ee782ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f8aab92837f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f9269d629362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5f97bdd66f216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5498/5127/files/volleyball_rules_in_telugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9833/3092/files/play_store_apk_para_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6fc45b-6f68-49e4-b679-5a765a61d5e3/61775340062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b934b2-5112-406b-bf7d-3c28d5e0a1e2/nobezulaxiwimav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4812/2527/files/nerf_vulcan_voltage_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff94bff-3166-41fd-b17e-20a3adf46a3a/81186827273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7214/2497/files/hotstar_premium_mod_apk_download_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6057893c-006b-4e11-ac4f-18063a338aa4/zolixepatafovametinos.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000c749.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC749 29220 bytes
SHA-256: 1d772f843bb8d45c9583fa061e7ae69c6c119b37c943cb6434ef8f30a4af1bd6
font_00_sfnt_off00008fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBE 5596 bytes
SHA-256: 3b6fe543ff78d8d4011254f20463769c078dc2e02df4a4d4003403cc76ee8e11
font_01_sfnt_off0000a2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EA 10516 bytes
SHA-256: 82b9c11afc8a884462de8609ad116667d987b85c39182b09d15047af502e805e

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