Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f271a2c0d6d7c41…

MALICIOUS

PDF

37.1 KB Created: 2020-08-19 09:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f46bf4697498f23118d0c8115e42edd6 SHA-1: 34ddae814efa9b3d02b53c4b36d0c9c208e3ed4e SHA-256: 6f271a2c0d6d7c410e426e73f69500c31aec75f2ad31156570954d3c04225441
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading software. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector and a link farm suggests an attempt to distribute malware or lead users to phishing 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.cc/pify?keyword=audacity+for+mac+sierra
    • http://zapes.sq3media.com/uploads/1/3/1/4/131437064/wizixutewawefipaxita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7975/3109/files/12029378461.pdf
    • https://cdn.shopify.com/s/files/1/0440/9170/3448/files/bbc_learning_english_news.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8909/files/vajaludaleta.pdf
    • https://cdn.shopify.com/s/files/1/0432/1155/4980/files/zazibedabimur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/arya_samaj_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/metebupekosetoderefiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0225/5770/files/the_satanic_bible_anton_szandor_lavey_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/nonlinear_dynamics_and_chaos_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0463/3024/9377/files/nagenusolositixu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/3d_exporter_for_autodesk_fusion_360tm_trial.pdf
    • https://cdn.shopify.com/s/files/1/0436/4346/9974/files/kodefepimevipu.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_off00005320.bin
8fd4ee401175e1598b98ca19f2d81315856db29710b2afc19759dc0911bc18dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5320 5228 bytes
font_01_sfnt_off000064d2.bin
d2778008abba038b6ac28a785be74f3ff4f5e282a291dedfbebcc81e0b4aeb87
pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 10352 bytes