Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f20cd48d5755a0c…

MALICIOUS

PDF

44.5 KB Created: 2020-08-24 14:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dda1681df7e0293c0ce161353a75f72 SHA-1: e8bddec08be94eaebfb88de5455540f4d7fe4e24 SHA-256: 7f20cd48d5755a0c3828f487bedadef4992eef32dc088411026ea53443985752
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains the malicious URL and appears to be a lure for users interested in pet care, aiming to redirect them to a potentially harmful site.

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=heterodon+nasicus+care+sheet
    • http://files.tattoocurt.com/uploads/1/3/1/8/131857315/4522594.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/95799637637.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/kib_monitor_panel.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/sozeduboxebebijezelew.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1984/files/bumurimenodevofazuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/9814/2875/files/beers_criteria_pocket_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8023/files/48584033478.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/shell_script_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6423/files/64784823939.pdf
    • https://cdn.shopify.com/s/files/1/0431/1246/4550/files/ac_dc_electrical_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8831/files/tesakoderimumekifeponuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/list_of_important_inventions_and_discoveries.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_off000071e8.bin
b4f88692702d4d807d69f342c9691a57b59010d717a61ed9dbc77ebc5e043178
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E8 4956 bytes
font_01_sfnt_off000082b4.bin
71047880327884c7b179909a008f836fddb315635107c90805f495ab957c3530
pdf-font-stream PDF embedded font (sfnt) at offset 0x82B4 10196 bytes