Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52c96d3b32d3dfc…

MALICIOUS

PDF

39.8 KB Created: 2020-07-30 22:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e34816f0b39b5504e6db83ffdc21d2 SHA-1: 4f8173be8a9703d6b57eac42ec746e033df9596c SHA-256: e52c96d3b32d3dfca153d57e68949ebedf6c611e198612fb4b505cee902adb62
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of these links, https://ttraff.ru/pify?keyword=medical+terminology+for+interpreters+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of the link farm and malicious redirector strongly suggests a phishing or malware distribution attempt.

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/pify?keyword=medical+terminology+for+interpreters+pdf
    • http://files.jewellhjohnson.com/uploads/1/3/2/8/132816158/252b1d3f634b0.pdf
    • http://files.allthingsartstudio.com/uploads/1/3/1/6/131607407/lewipukokuxo_texizev_kokem.pdf
    • http://files.midsomersetmartialarts.com/uploads/1/3/0/9/130969241/gojoludemoxo.pdf
    • http://files.bespokecabinetworks.co.uk/uploads/1/3/2/7/132740399/2749473.pdf
    • http://files.glimmerglassaustraliancattledogs.com/uploads/1/3/0/7/130738764/gevelerijobo.pdf
    • http://files.jewellhjohnson.com/uploads/1/3/2/8/132816
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/sojujojozafozezotu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/xaxasuxogan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0141/files/rimokeri.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/26928931888.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/36375852606.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4556/files/57478184869.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/sajunedutiwolitefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/megomububoramiwuxi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/3773293606.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/31429120322.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/42190691920.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/24767271151.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c5b.bin
6db0886a045bb968e980161a0900d561969811be81fcf4380a94170e75bc30fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5B 5368 bytes
font_01_sfnt_off00006e8e.bin
140d20b0574eb5d1e3df009edae5dc2df15b6e7fc06b308ec7b0ff4ba2266b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8E 10232 bytes

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