Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f679790ea1e21c4…

MALICIOUS

PDF

34.5 KB Created: 2020-08-30 17:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f101453fe38686efbcbd78e198f934b SHA-1: aee536fbea36d4218c9c20bf8fab80727b56b5a0 SHA-256: 5f679790ea1e21c413131d27dedfd2deff22f82257367a6fa7da67ad670343d1
154 Risk Score

Malware Insights

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

This PDF document contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially obfuscated, includes the primary malicious URL and numerous other PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=monster+hunter+stories+glavenus
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/3114851384.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7247/files/vadoweziwidepepizirujugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9338/3585/files/31561814819.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/xuwixadisowewotuxeko.pdf
    • https://static.usrfiles.com/ugd/b8c837_9979734c352b4e92a8f1826d6c7d9f22.pdf
    • https://static.usrfiles.com/ugd/3e9e83_ab325c2fa916477888fa9af77b2cf945.pdf
    • https://static.usrfiles.com/ugd/b8c837_3df649c4ffdc4755ad0877157f347219.pdf
    • https://static.usrfiles.com/ugd/aff7ca_57432afb0bfb45679253c28953c7daf5.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/90946104527.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/python_binary_search_tree.pdf
    • https://cdn.shopify.com/s/files/1/0431/3245/3015/files/vugogutavawuzaxamobe.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/kodefobesawaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/jakakix.pdf
    • https://static.usrfiles.com/ugd/cf79db_f03a6a4c74b14411a1e3f6a4e5c11c5a.pdf
    • https://static.usrfiles.com/ugd/3e87bf_d75826c282fc44f59df5015492ba48c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba81411a5788433eb5a317c500da141c.pdf
    • https://static.usrfiles.com/ugd/e643da_4f84362b9e5d487b84bdf7b56a64d35c.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_off000048e4.bin
978cdce5c725b2dde570efdca9fc7de5e827f63af3235a9a77b19155db1eefda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E4 5012 bytes
font_01_sfnt_off000059f6.bin
71393a88a4f11234b359716fa32d8e5c5c1134a8427667c92590bb2360fa1c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F6 10336 bytes

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