Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d1eb4931db2354…

MALICIOUS

PDF

45.4 KB Created: 2020-10-25 07:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: ff1b80fe6cc75b4afe4a63eb1fdb34e8 SHA-1: a6be71b6212a0b37d7a4f7cd8e3bd78fe8c86405 SHA-256: a3d1eb4931db235437a69c7abef7dc3e2a39efcbb73808feb0193d41ec58ecd4
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=atlas+ti+descargar+gratis+espa%25C3%25B1ol In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f944adee2a1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f913faa40878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5f94fea1d41db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_5f94e4b797da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5f8bacd28da0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006de6.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006de6.bin)
    • https://cdn.shopify.com/s/files/1/0268/7559/2888/files/94284190403.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/77760065221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9981/6090/files/pawutizojotorifosupo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0626/2948/files/8_ball_pool_cheats_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/27702514683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a2328a-a5cd-4f87-a5b5-01ae044bd505/vikawaporukapijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c664ac-4457-48d4-aad2-873120afe948/50422588858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946ccdb5-7961-414c-a8ea-7ee67be26360/rodunajukujoganominuniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f27ce5-5fed-42cf-b290-f197bac0d3ab/convert_musescore_to.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9068/3065/files/93362626098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5933/7621/files/fitbit_alta_charger_walmart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6088/7197/files/fomitizoxatapemiwetat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6374/5953/files/56902496759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8118/6972/files/swtor_companion_gifts_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7959/0588/files/4045351434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4108/6359/files/wow_cataclysm_herbalism_leveling_guide_1-525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7896/5166/files/vewegovugedubovesekut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3921/9099/files/melocoton_loco_descargar.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 extracted file (font_00_sfnt_off00006de6.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE6 5440 bytes
SHA-256: c750579632c6cf3ba18be7eda7791d6c2d491d0e7ce5114370fabb708ba264f5
font_01_sfnt_off00008036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8036 11540 bytes
SHA-256: 0bd68851404072fde96e1c6ed246a31c87bbf6181c676a3a642c40155195d64a