Malicious PDF — malware analysis report

Static analysis result for SHA-256 192e5fcbd8f1a08a…

MALICIOUS

PDF

46.7 KB Created: 2020-08-31 22:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65b50cef05e7a3ec55c064523b744942 SHA-1: 80cc2fcaffb1137b275de28e396adaa43f9f90b0 SHA-256: 192e5fcbd8f1a08aa443514957566e862d6285865bbcbdc9b9f36b25930a580e
154 Risk Score

Malware Insights

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

The PDF contains a deceptive message about memory errors to trick users into clicking a malicious link. This link redirects to a known malicious domain, indicating a phishing or malware distribution attempt. The PDF also contains a large number of external links, many of which point to benign content, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector.

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://ttraff.com/pify?keyword=not+enough+memory+to+read+worksheet+powerpoint
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/9dda13_c3f4af1805df4d3fb0cda69e2486a9fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_4de5c01c304244a2830e8bc241186176.pdf
    • https://static.usrfiles.com/ugd/696b8a_08dd82029402499f90ede6b4f1130281.pdf
    • https://static.usrfiles.com/ugd/a59130_7e31932687ff45cd8951715ca203f28e.pdf
    • https://static.usrfiles.com/ugd/79e0dc_5723d35ae1bc44dfa6870c4ab3e444bf.pdf
    • https://static.usrfiles.com/ugd/fb5067_eacb79e12eec402cb73dd9740771fe78.pdf
    • https://static.usrfiles.com/ugd/6c98bc_afe3b4714861492db53d3f39763d4a8a.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/martin_fowler_enterprise_integration_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0462/7582/1728/files/letter_for_school_admission_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/online_classical_guitar_tab_archive.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/christmas_card_templates_for_cricut.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/arsene_wenger_biography.pdf
    • https://cdn.shopify.com/s/files/1/0434/0246/1351/files/wujabigosebupigoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/kogaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4573/files/mupepefalawabuwata.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006942.bin
2831a8b2b39a7152262e4070513e42fb9c21c493dfa5c269bbcce7c7bfd409fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6942 5452 bytes
font_01_sfnt_off00007bb8.bin
4d0fb4c0d3e2f81380cbf160a83ce05dd87f4bc2d77ef05877c9111cde4f624f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB8 10428 bytes
font_02_sfnt_off00009f66.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F66 4324 bytes

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