Malicious PDF — malware analysis report

Static analysis result for SHA-256 890c59b41c156500…

MALICIOUS

PDF

41.1 KB Created: 2020-08-13 23:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10e9fda424b5b24217d800ede06a9002 SHA-1: 226509cce6b724c0b7885bdc304b1fc4d5345572 SHA-256: 890c59b41c15650078b3858ad238aa779d1c5dafc7accaaf1dc24e2dffb1fd75
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=microsoft+word+2019+calendar+template', suggesting a lure to download a template. The PDF also hosts a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, likely for SEO poisoning or to distribute further payloads. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=microsoft+word+2019+calendar+template
    • http://files.sunkissedhairco.com/uploads/1/3/1/4/131437474/pozudidigolon_devog.pdf
    • http://files.hatfieldr.com/uploads/1/3/0/8/130874683/xiligilepezotiz.pdf
    • http://sebabax.buhrmasterfarms.com/uploads/1/3/0/8/130874359/wagolejon_ratisotisuniv.pdf
    • http://files.addisontreeremovalmemphis.com/uploads/1/3/2/6/132680813/pijidopetatasu_lagexoso_dumozobuvur.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/mitodozakax.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/purabikufokelatuxedurepo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/godimovim.pdf
    • https://cdn.shopify.com/s/files/1/0435/9471/1203/files/vmware_fusion_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/62631089952.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/cash_flow_statement_problems_and_solutions_direct_method.pdf
    • https://cdn.shopify.com/s/files/1/0433/9725/1235/files/kuwivuderixurofugilexi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/arithmetic_sequence_problem_solving_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/today_sandesh_newspaper_ahmedabad.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/patujusumedarumugigagejen.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006126.bin
8e8813aa7e9a68e97c07277f9a3d97b9888dd6708934189102d67b54a2b69916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6126 5880 bytes
font_01_sfnt_off00007528.bin
56bdd32de3ff1275e7e9253879a242247826ef21c5061ee20ccc3421f9acab85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7528 10064 bytes

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