Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afbf945a174ca32…

MALICIOUS

PDF

40.7 KB Created: 2020-08-04 14:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c5ad1bfc155e701ad24f8272f60a12c SHA-1: cb3e83a31831c6135da7bd370c552da3dd46d38e SHA-256: 6afbf945a174ca32f2bd0c1a822f2023d202c477edb38030e6e5adeda0e7939e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to attract search engine traffic and potentially lead users to malicious sites.

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=sepse+neonatal+2020+pdf
    • http://zuxinak.heatherscustommeats.com/uploads/1/3/1/3/131383648/sivabafexexa_muzofapomos_najokilufexoroz.pdf
    • http://files.brunswicktravelbasketball.com/uploads/1/3/2/8/132814030/fd3813.pdf
    • http://files.406cavoodles.com/uploads/1/3/0/7/130775892/tefigekusugen.pdf
    • http://kekaguga.ask-noodles.com/uploads/1/3/0/7/130776760/xovimogi.pdf
    • http://files.bearvalleymensministry.com/uploads/1/3/1/4/131484395/305540c096.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/senow.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/zovajajivamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7887/files/63038508247.pdf
    • https://cdn.shopify.com/s/files/1/0428/5058/2684/files/90607161731.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0818/files/88898863091.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5271/files/buwozabevuked.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/dallas_cowboys_cheerleaders_salary_2016.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/lufulejiji.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/die_dreigroschenoper.pdf
    • https://cdn.shopify.com/s/files/1/0437/5199/7592/files/boretuminabizunaxuni.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_off00006188.bin
6592216a76db8a93dd255602586c1ec9bf941646892334becc8f9cf3b229be62
pdf-font-stream PDF embedded font (sfnt) at offset 0x6188 5316 bytes
font_01_sfnt_off000073b1.bin
a3696f9391c9e0799896af3f2d8b9df34915c6f7d888409c61c66d568e00f98d
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B1 10148 bytes