Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bed0419a0c87d0…

MALICIOUS

PDF

57.4 KB Created: 2020-10-28 11:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5fd381d5881ca00faebefc27f2da74d1 SHA-1: eaf54fe6faa79c0d5f92ba60443e85a7c242396a SHA-256: d8bed0419a0c87d04c82aa6c4260c2bac186a15709092330ad630a248ab53609
194 Risk Score

Malware Insights

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

The PDF file contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a product name ('Asics gel tech walker neo 4 women's') and the malicious redirector URL. This suggests a phishing or scam attempt disguised as a product listing, aiming to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=asics+gel+tech+walker+neo+4+women%2527s In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5f8dbd617ec72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f87c7fbf0ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5f8d46c21bf54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f94a6d176832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f8cbc0bb4be0.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/1/0500/1392/9630/files/19339774164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7685/3153/files/android_carousel_viewpager_library.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/93632580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2715/9448/files/86881268543.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7698/6034/files/anti_delete_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8170/4632/files/35216659607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/sitipepiruxoxumisuzodev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8632/4933/files/the_great_gatsby_study_guide_answers_chapter_7-9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7898/4878/files/bias_t_circuit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3916/2005/files/pedipowapipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0771/1653/files/saluyot_plant_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/4560/1447/files/black_clover_rill_vs_luck.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/beyond_the_bermuda_triangle_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/74301926393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8151c3a5-8a66-4290-bbb8-0022496bfdbf/p90_simple_kitchen_nutrition_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/437e140f-2273-460f-9a7b-8b6c94b23754/30277809306.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_off00009790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9790 5480 bytes
SHA-256: e9c845ae3e18debaecde7ccfff79c987e53cf8409b646d3e54f4e618054434ea
font_01_sfnt_off0000aa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA1C 13616 bytes
SHA-256: 6dbabb221b0779a25d5ed9a1f359825ca82bf998a93404c3df127018232ed4c6