Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a2a89f35afc296…

MALICIOUS

PDF

41.4 KB Created: 2020-08-29 10:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66f2690c7e2edb651b9f455866b20853 SHA-1: 1748e5c8d643958ab4225f807b9609a04fcae622 SHA-256: 65a2a89f35afc296f68eaba0fea0adb0ec5f5daa4d611475fd0fe3d15fd1b4a8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, suggesting a phishing or scam attempt. It also hosts a large number of external PDF links, many of which are benign but likely serve to mask the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed to obscure malicious activity.

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.cc/wix?keyword=ark+brightness+fix
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/2789/6219/files/sepsis_2018_definitions_and_guideline_changes.pdf
    • https://cdn.shopify.com/s/files/1/0438/2500/4706/files/2002_ford_expedition_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2821/files/mexorid.pdf
    • https://cdn.shopify.com/s/files/1/0440/6195/0117/files/apache_tomcat_8._5._37.pdf
    • https://cdn.shopify.com/s/files/1/0433/4167/6694/files/84919234211.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8da0a2ebd3c435982535227b14ce1df.pdf
    • https://static.usrfiles.com/ugd/b8c837_133a095451e74cd9ab17de8f591822b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c97c209e9fcb4f68998127364d7fa279.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f776df66d0d40f7ade6c47fe730638f.pdf
    • https://static.usrfiles.com/ugd/b8c837_abc3e005cb1944a68b44866847aeac19.pdf
    • https://cdn.shopify.com/s/files/1/0443/8504/2598/files/cazadores_de_sombras_los_origenes_angel_mecanico.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6324/files/33441934262.pdf
    • https://cdn.shopify.com/s/files/1/0433/9272/9246/files/15778170192.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3707/files/epidemiologia_social.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_off000058a5.bin
ce074600252d342d70ed8bd6d2640e470a4fa6eaacf8fc626ce9cbdf328b64dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A5 4724 bytes
font_01_sfnt_off000068b0.bin
39f9f4b912fc0b64377d3c9bd8bc9eb23ab3f29c68099396fd30a0bedd9f9521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B0 10072 bytes
font_02_sfnt_off00008b2c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2C 4324 bytes

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