Malicious PDF — malware analysis report

Static analysis result for SHA-256 034ea543d9e6b3bb…

MALICIOUS

PDF

48.2 KB Created: 2020-09-18 01:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d17e6de56eabdcccd968fc39c61d15d SHA-1: 3fd5ab5726fe2dd0b3e19e58b11275a716af3c4d SHA-256: 034ea543d9e6b3bb3221859c3d03bc664db452a019dd058d16456101e7df842f
154 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a manual, likely a lure to encourage clicking the malicious link. The presence of numerous other PDF links suggests a link farm or a method to distribute further malicious content.

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.club/wix?keyword=brother+xl+5500+sewing+machine+manual
    • http://bomidor.mystiqueproductionsdjservice.com/uploads/1/3/1/3/131380160/lajejefenowi.pdf
    • http://kuwifoten.percybio.com/uploads/1/3/0/7/130776819/roborupigon_kajabuf_sumumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4a50077f-8652-4783-acd1-8a26ba3cb90c.filesusr.com/ugd/b926a8_46f06c7ed2d54ec7a11081369f252d31.pdf?index=true
    • https://e1f0b4fc-9650-4e59-bebe-19ac49cb6977.filesusr.com/ugd/dec231_1a2283e2b529499cbdc7b95532bad8c7.pdf?index=true
    • https://1b596abc-7c9d-40c6-a544-7b562ea69891.filesusr.com/ugd/217b8a_a86a164b180c46c79265433250116cfe.pdf?index=true
    • https://f64aef82-f009-453a-b9a1-5c97f0234f44.filesusr.com/ugd/8acad3_b7db4e10e11641088fb3977421dd34bb.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/2828/2529/files/tobirukaweka.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/big_ideas_math_algebra_1_california_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7786/9476/files/avast_removal_tool_free.pdf
    • https://cdn.shopify.com/s/files/1/0452/2960/5024/files/78948639267.pdf
    • https://cdn.shopify.com/s/files/1/0437/9282/6517/files/kugesesunidarodujakagax.pdf
    • http://files.alinken.people.ua.edu/uploads/1/3/0/7/130739678/f467322b73a.pdf
    • https://cdn.shopify.com/s/files/1/0428/1440/6823/files/28452514621.pdf
    • https://cdn.shopify.com/s/files/1/0439/3802/1544/files/super_vpn_android_apps.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9107/files/pugavomizemamo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c43.bin
8aa40e9f42784a23fd3c83ca1c0ef8ae4d97ad22d49b2a4cdfde898dc0c6d54b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C43 5688 bytes
font_01_sfnt_off00008f8f.bin
4626ed191d5e6db0a66845f33e2619c429ffde2edcbcd956e5dd22c92373f15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8F 10632 bytes

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