Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f59c74ccb1f497…

MALICIOUS

PDF

35.7 KB Created: 2020-07-09 11:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19018e44b5a758f17833cdf46bcb74d3 SHA-1: 02e3e6e9b746b473c6c3a522a5085e65d01a7b54 SHA-256: b9f59c74ccb1f497eab7d0bfef10662ea1c2357a970f77b6c447a76dec2c360d
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to link farms designed to obscure malicious destinations. The primary URL, 'https://ttraff.ru/pify?keyword=derecho+civil+pdf+unam', is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a mass external PDF link farm. This suggests the document's purpose is to redirect users to potentially harmful content.

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=derecho+civil+pdf+unam
    • http://files.thinkanomalous.com/uploads/1/3/2/7/132710787/nejugo_fetaxen_vijixer_nujogutoninuj.pdf
    • http://files.sdg.services/uploads/1/3/0/7/130739419/zifanavulako.pdf
    • http://files.johnstownchildcare.com/uploads/1/3/1/4/131483154/kopaseresoten_bidis.pdf
    • http://files.crestllc.com/uploads/1/3/1/8/131858975/wugune.pdf
    • http://files.ict-makers.com/uploads/1/3/1/3/131380894/02becf4045.pdf
    • http://files.orlandolakefrontth.com/uploads/1/3/2/6/132681264/nodufadorugejewi.pdf
    • http://files.battambangparish.org/uploads/1/3/2/6/132681002/d767baf407e6.pdf
    • http://files.theplayfactoryplaygroup.com/uploads/1/3/2/7/132741064/bokuxawoguxe.pdf
    • https://joginadu.files.wordpress.com/2020/06/gujoxadati.pdf
    • https://nurizowi.files.wordpress.com/2020/06/rezonifubuxovatujam.pdf
    • https://vajepevugu.files.wordpress.com/2020/07/71212007658.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6735074847.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56346524494.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatamukizulenekop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wuwikeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/magobusiriwolozun.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_off00005465.bin
0358ba56b6596ecb58a403b67d8c329cb4d9b926765228639aa04cef33b3cc8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5465 5080 bytes
font_01_sfnt_off0000657f.bin
0c010eb9741033444577fdb7c903561275c63d7013abda8cd3a973dc4d53bd51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657F 8988 bytes

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