Malicious PDF — malware analysis report

Static analysis result for SHA-256 71594bb5df2718e6…

MALICIOUS

PDF

36.3 KB Created: 2020-08-09 08:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e9fc46a17dcab69aa54ab14894a501d SHA-1: f24e1fb96428d55c661f3ea3171c18a83a87c6d2 SHA-256: 71594bb5df2718e6cfe5c405103570cf597575438232632da16c91a370e15309
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of numerous links suggests an attempt to manipulate search engine results or phish users, and the document body contains a URL that leads to a malicious redirector.

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=beatriz+sarlo+la+imaginacion+tecnica+pdf
    • http://files.anythingpaperkim.com/uploads/1/3/0/7/130739824/9923213.pdf
    • http://files.foretnumide.com/uploads/1/3/0/9/130969983/soxowi.pdf
    • http://files.michaelgreermd.com/uploads/1/3/0/7/130740073/vomadukizotol_zosexesakinu.pdf
    • http://files.madisonbizreview.com/uploads/1/3/1/6/131637701/dikagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/ave_maria_gounod_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/grade_8_math_practice_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/ecological_succession.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/bescherelle_cole_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/83306995590.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5190/files/amazon_cloud_practitioner.pdf
    • https://cdn.shopify.com/s/files/1/0437/8253/7365/files/install_dmg_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4229/files/dotomaxojam.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/serial_office_para_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/92381608271.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1944/files/bewulifivub.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_off00004bf3.bin
72c22b1263bc64f581f3ddc4625fc4507608c60ecbae1b7f81f172ceb27a95c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF3 5572 bytes
font_01_sfnt_off00005edc.bin
fa2097820176913c59a41f719af5006575e1501270d44a026a2817139207b0e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDC 10824 bytes

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