Malicious PDF — malware analysis report

Static analysis result for SHA-256 033ab176ec536a1f…

MALICIOUS

PDF

44.3 KB Created: 2020-08-08 21:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1117742ed405cf0a6e71d02729105e6 SHA-1: c7ec31a7c11b73e5f063243e7775532716ad6900 SHA-256: 033ab176ec536a1f52ea3b04aa0975d5b8d6a1f060b8ea65dc5e4cb571410374
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirectors and potentially malicious domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to lead users to harmful content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=baseball+field+positions+template+pdf
    • http://files.swisscompleteeyecare.com/uploads/1/3/1/4/131453695/c9a94a04a488e.pdf
    • http://files.beefcakedanes.com/uploads/1/3/1/8/131856852/pebimidunolusu-bojitip-ligetaja-kaligidejoza.pdf
    • http://fosadede.centerforspirituallivingsouthernri.com/uploads/1/3/0/7/130775162/9528986.pdf
    • http://pezofu.bournemouthoutriggercanoeclub.com/uploads/1/3/1/4/131453494/4359023.pdf
    • http://files.firstbaptistwesterville.com/uploads/1/3/0/7/130739651/02e8fa31cda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/webumupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0803/1893/files/basic_java_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/bupizanesurani.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/vamegogokifumowojumus.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/motocross_nitro_hack.pdf
    • https://cdn.shopify.com/s/files/1/0436/9232/7077/files/rogoxunutazutidepuni.pdf
    • https://cdn.shopify.com/s/files/1/0431/2963/4970/files/lelajiwatolemepajeju.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0447/files/46749878172.pdf
    • https://cdn.shopify.com/s/files/1/0428/6388/6495/files/nolevivanavisikuluwusufu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/newakogifitufemujesewug.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/16037647870.pdf
    • https://cdn.shopify.com/s/files/1/0431/3271/5163/files/92366599147.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_off00006f7f.bin
ab4d6cc1ed6c484dc4ca9835c193f21e28afb03b4a69be177b88a522130db1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 5280 bytes
font_01_sfnt_off00008163.bin
06fa789edb468e66be5bddcbd22a05de52c9b04c5a15501b27da2184d20b922d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8163 10240 bytes

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