Malicious PDF — malware analysis report

Static analysis result for SHA-256 1467df673b9ea6ac…

MALICIOUS

PDF

80.1 KB Created: 2020-08-23 17:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1b4b512d28ef9d08b3039316b395f17 SHA-1: 717b28bb90a350bb496ae3f41b96b4af73576b74 SHA-256: 1467df673b9ea6ac38d4ce4476f8e9a4c9091a3e4b489048a994a7d7cd89cafe
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm and a lure suggesting the user install a browser extension or update to view content, which is a common social-engineering tactic. The primary link, 'https://ttraff.ru/pify?keyword=bronchiolitis+aap+clinical+practice+guidelines', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=bronchiolitis+aap+clinical+practice+guidelines
    • http://lagixato.actonlocalmarket.com/uploads/1/3/2/7/132740619/nutepoxuta_lidof.pdf
    • http://files.vaughanstx.com/uploads/1/3/0/8/130813645/6726d418.pdf
    • http://files.america1funding.com/uploads/1/3/2/6/132696351/fuzalez.pdf
    • http://files.brewsterfamilystory.com/uploads/1/3/0/8/130813054/sokadole.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/renewable_energy_sources_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5610/files/lilazuwiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9067/3813/files/decimal_to_fraction_practice_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/babape.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/88383528410.pdf
    • https://cdn.shopify.com/s/files/1/0428/8262/9798/files/dasar_dasar_akuntansi_jilid_1_al._haryono_jusup.pdf
    • https://cdn.shopify.com/s/files/1/0437/6287/6565/files/dajez.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/66854556359.pdf
    • https://cdn.shopify.com/s/files/1/0434/0305/1175/files/acrolect_mesolect_basilect.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_off0000eb5d.bin
cbe8dfcd1aff80d1a7750f62d22612b6d4694f774c5353ab4c03c5f9407cebb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 5268 bytes
font_01_sfnt_off0000fd2a.bin
9f496549c021b3598139936fe1bd674cd7752b89e01ed35539e1e099427d67f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 12576 bytes
font_02_sfnt_off000124c3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 4324 bytes

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