Malicious PDF — malware analysis report

Static analysis result for SHA-256 084f8f2e3d96b50a…

MALICIOUS

PDF

44.9 KB Created: 2020-08-27 13:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c286c08335bd11d9a7a7d7a3973674 SHA-1: a55adda30dc079c642c3f50279a973fdac616a5e SHA-256: 084f8f2e3d96b50ac1d8a3259177ac60dd770ab927c05f92a3ceb6779db3ec22
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, forming a link farm, and one of the initial links redirects to known malicious infrastructure. The document body also contains text related to software downloads, suggesting a lure. The presence of a password-protected archive lure heuristic indicates an attempt to bypass gateway scanning.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=tis2000+software+download
    • http://dedume.denas-therapy.com/uploads/1/3/0/7/130740062/fopukeruredufo_vugadoganote_sokig.pdf
    • http://files.joyofmakeup.ca/uploads/1/3/1/8/131856247/5164795.pdf
    • http://files.olphyd.org/uploads/1/3/0/7/130738504/3955761.pdf
    • http://junivep.tribalexperiences.com/uploads/1/3/1/4/131406893/398726.pdf
    • http://www.mediafire.com/file/bc9
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/54571505889.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/vigumopiwesilebiben.pdf
    • https://cdn.shopify.com/s/files/1/0437/9253/1617/files/mabojuma.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/66497623815.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/amc_lennox_town_center_24_columbus_oh.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9069/files/the_bedford_diaries.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/49226095888.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/miduwusutudaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/lodixovemavupamo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/daraf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/kwsp_table.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/aprendizajes_clave_para_la_educacin_integral_sexto_grado.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_off0000714b.bin
8aeec75f17917595df6249d5d375f3cc98754b0f2faef61384bb58d2543637b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714B 5216 bytes
font_01_sfnt_off0000831a.bin
ac380b081926ee28e0e3d5ca0a76309ed083336cdda1a92d15aeb6a5371a6052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x831A 10420 bytes

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