Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ce57183148d6cf…

MALICIOUS

PDF

38.8 KB Created: 2020-08-15 16:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3328584037379f5e0424a3348e09cb7b SHA-1: de7c2db909909aa2a944bd292aac57478d821d0f SHA-256: 11ce57183148d6cfb10b1265265075ada0010bda0870cf2ccd05e6eec6a9ffd3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The presence of a large number of external PDF links suggests a link farm or a method to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting the classification of this PDF as a malicious document.

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=aaa+2018+full+sub+indo
    • http://files.goldbergiryami-taxcert.com/uploads/1/3/1/4/131437711/raduropogipo-mawad-neworafe.pdf
    • http://files.revelstokeflorist.ca/uploads/1/3/2/3/132302876/bibomedo_vipux.pdf
    • http://files.rynshell.com/uploads/1/3/1/0/131069899/xofuwemuj.pdf
    • http://files.visithammondny.com/uploads/1/3/1/4/131437308/vufagikuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/circuit_board_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mazimuzoxoku.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/48332351021.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/xomozo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/58860237631.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tunamowari.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/wuwawurojezuwibimifeduj.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/16332801756.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/19949931640.pdf
    • https://cdn.shopify.com/s/files/1/0445/5959/7727/files/inhibitors_of_protein_synthesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/josurenadebosimasulad.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/service_communication_failure_pnkbstra._ex.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6301/files/naming_2d_shapes_worksheet.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_off0000543a.bin
f4125555627d8ad00dc1e1eea98ccf7ed1d63379976b85e1fb76a5c4a9c2d7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x543A 5456 bytes
font_01_sfnt_off000066d1.bin
e3bd5ad79ecdffd218019cc5c0eb77b057a3c3f386dc22502e3bf067b6a8a34b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D1 12424 bytes

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