Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac95cea055a6ce5…

MALICIOUS

PDF

46.7 KB Created: 2020-08-19 14:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f94d6fb8f73e695d87536e0e3bcad954 SHA-1: f1e69de05876c0421f11386c86713e0837c1236d SHA-256: 0ac95cea055a6ce5b27bed6c14be87e3eb11f667ee122faff0ec312e0462da06
154 Risk Score

Malware Insights

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

The PDF contains a deceptive title and numerous embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

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=short+answer+type+test+in+english
    • http://memem.midwestcovers.com/uploads/1/3/0/8/130814328/gufakola.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2275/9582/files/fufomidejolukivomoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/23190509826.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/44959784624.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/learn_python_3._7.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/8997/files/zegatubevafijobojuzek.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1733/files/66142979009.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/xezabazukixovewize.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/23886876523.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_off000077c6.bin
a71583befd1f4ab4490fbf22a0cda59d03a669e7df8499e27b05ac250ec22f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C6 5376 bytes
font_01_sfnt_off00008a18.bin
aea4546f3ff05f3c196c33286f039503fab9ef846c37eee0f4080e3583afeb75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A18 10760 bytes

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