Malicious PDF — malware analysis report

Static analysis result for SHA-256 087bfb0a34c03c87…

MALICIOUS

PDF

48.4 KB Created: 2020-08-30 17:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 861d4440290f3acf26f3b6b510bc14a3 SHA-1: 14e2b0a176775890e7cf8361ae4497ab6a60231e SHA-256: 087bfb0a34c03c870a06daf7e7a63eeaa1fce261a2dadbf07d87dca3662660aa
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, classifying it as a PDF link farm. One of the primary links, 'https://ttraff.ru/wix?keyword=greek+deuses+de+mitolog%25C3%25ADa+e+nomes+de', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the malicious redirector suggests an attempt to lead users 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.ru/wix?keyword=greek+deuses+de+mitolog%25C3%25ADa+e+nomes+de
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/chocolate_truffle_cake_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/forekisewajavo.pdf
    • https://cdn.shopify.com/s/files/1/0460/6980/9316/files/kuzotabusupitu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/padi_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3600/6817/files/remote_sensing_technology.pdf
    • https://static.usrfiles.com/ugd/b8c837_012066c4100a4d72aa42819e8794940d.pdf
    • https://static.usrfiles.com/ugd/3e87bf_867c7b4590f1467da943c5b34d677ce1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b7039da0d7347e782c7dc53500da723.pdf
    • https://static.usrfiles.com/ugd/6240f8_7e7e2ca0541845419d2c339dadf48381.pdf
    • https://static.usrfiles.com/ugd/b8c837_38d7b0e6c97e424aa457235151730891.pdf
    • https://static.usrfiles.com/ugd/d17951_de6654903ac445e4886454378176d3c0.pdf
    • https://static.usrfiles.com/ugd/9e41f0_656348b38cd144b591d2d20bbcc3e788.pdf
    • https://static.usrfiles.com/ugd/b8c837_12f9d3d6161947c6aca4565ed9c2ee0d.pdf
    • https://static.usrfiles.com/ugd/d5415a_3fc038dd8c924028bcb6995b71266e59.pdf
    • https://cdn.shopify.com/s/files/1/0440/7230/4790/files/xifikiw.pdf
    • https://cdn.shopify.com/s/files/1/0441/2735/5032/files/example_of_passive_voice_change_to_a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007294.bin
719165e2cf18f576dbe1e307eaf53ab554cb5d281b5be09222222089d2612989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7294 5292 bytes
font_01_sfnt_off00008485.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8485 1800 bytes
font_02_sfnt_off00008d13.bin
e7765063fc67c9ce7c54d06a68734ca69b11fe33238779b9912add3942f1f543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D13 12208 bytes

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