Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da254a212b2a84b…

MALICIOUS

PDF

41.4 KB Created: 2020-08-18 20:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 410b83f044766522ce73f198ca16a943 SHA-1: a7a0967346442137762f156ebeaa26668c87139b SHA-256: 6da254a212b2a84baa1801db33ae963fc130db74169510deca3f498322fcf8ad
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, disguised with a keyword related to 'atypical pneumonia'. The document also features a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a phishing or malicious redirection attempt.

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.ru/pify?keyword=atypical+pneumonia+pdf
    • http://wagapew.catmintcottagestreetcatrescue.com.au/uploads/1/3/2/3/132303382/4431803.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1195/5098/files/likorerojakakoximige.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/animator_vs_animation_game_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/rubetuxunutusowuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/7647/5290/files/instagram_old_version_app.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/17243041659.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/rs3_woodcutting_guide_f2p.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/linorupeduwag.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7566/files/4062723401.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/beekeeping_for_dummies_download.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_off00006491.bin
eb2007ec48f75a78aa0a6524348947afb210a1fce60ee5baf819b06b3108b850
pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 5120 bytes
font_01_sfnt_off000075f0.bin
5b9e56b0e51454ae5fc9afc7b2581a87c4bcd4382cdd52d6e394a380e1d3a5da
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F0 10540 bytes