Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aae8e2c8cf6410…

MALICIOUS

PDF

47.7 KB Created: 2020-08-31 04:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6de8988020f4dc860dbd7bdb78a082c7 SHA-1: e2fb3055b6122aae83d5bb96842af57dbe82b98b SHA-256: 70aae8e2c8cf64107c955eea7d6585982a21177f21f7117d7487a9fe84b19860
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'longhorn steakhouse nutrition guide'. The presence of a malicious redirector and a link farm suggests an attempt to drive traffic to malicious infrastructure, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/wix?keyword=longhorn+steakhouse+nutrition+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_20cd28342c4c4789b321a1bce7b0533a.pdf
    • https://static.usrfiles.com/ugd/221f3a_7b054dcfbda142098b3073bd0a901af3.pdf
    • https://static.usrfiles.com/ugd/89c6ad_b492d132bdf44d11b35a5ed83ff76b64.pdf
    • https://static.usrfiles.com/ugd/a91264_2e84f178f808402ebfc0c18fb5b830ff.pdf
    • https://static.usrfiles.com/ugd/95089d_dfa68310633a4b8c97731d867f1d6780.pdf
    • https://cdn.shopify.com/s/files/1/0434/0255/9655/files/66380876910.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/online_library_management_system_website_templates.pdf
    • https://cdn.shopify.com/s/files/1/0450/0570/1284/files/building_construction_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0826/0258/files/42689828302.pdf
    • https://cdn.shopify.com/s/files/1/0440/1076/6486/files/biological_wastewater_treatment_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0443/2871/4396/files/ludiwamopedekewufigedisag.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/cambridge_igcse_ict_coursebook_with_cd_rom_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9249/2963/files/wijinumemomelokabereg.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/11149068315.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1567/files/xupejalonirulazew.pdf
    • https://cdn.shopify.com/s/files/1/0446/6376/7203/files/n_vidia_8400gs.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/6491140207.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_off00007d73.bin
8f82271f11451d8b622895118de464de242b626c63aea61466525339f9afbe03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D73 5060 bytes
font_01_sfnt_off00008ea1.bin
262ee5293abdac32548f8abec4b131564b7a4d59cce14b23db1947eb1b80a914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA1 10352 bytes

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