Malicious PDF — malware analysis report

Static analysis result for SHA-256 65df4bb305fa2b69…

MALICIOUS

PDF

44.5 KB Created: 2020-08-20 07:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12328f7de5193bd6ee9e31881af9693b SHA-1: 39b3c99bb41e08554f3460546c16a656f836566a SHA-256: 65df4bb305fa2b691353f6dc16be637f49372fabd6c1ae4f97dc76cf70a090ef
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'leadership skills questions and answers' to entice users to click these links. The ML classifier strongly indicates malicious intent, likely for phishing or malware distribution.

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=leadership+skills+questions+and+answers
    • http://xipufud.imaniyako.org/uploads/1/3/2/3/132302868/dipuve_bodoj_dakival_tutipiwiw.pdf
    • http://files.shopcedarcreekgallery.com/uploads/1/3/1/4/131453588/sipupetuxugopuz-fatosavumep-zuzapopu-tusaxi.pdf
    • http://files.bluewaterfmchurch.com/uploads/1/3/2/6/132682829/votinimer.pdf
    • http://files.socialenterpriseecosystem.com/uploads/1/3/1/3/131379040/zafepatima.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/4208297625.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/nidivarexoziwarinesuxiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/cubase_5_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7784/files/dimijisapumegomegukejaxir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/kutawifimofijolola.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4917/files/college_accounting_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0741/files/zepipepirakeriborisag.pdf
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/18738502763.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/real_estate_salesperson_job_description_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/full_size_white_platform_bed_frame.pdf
    • https://cdn.shopify.com/s/files/1/0455/6374/0325/files/examples_accident_reports.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_off00006ffe.bin
fa7a3850d9ccd559b7dd20c6c025cf68efe96d2448ee75b8359c2e7ed6c60dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFE 5272 bytes
font_01_sfnt_off000081ee.bin
484369d6e4a872f23b01e017ccd92653c84e0e8c0ce084486ff5890781b352f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EE 10240 bytes

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