Malicious PDF — malware analysis report

Static analysis result for SHA-256 801217981b6d59ea…

MALICIOUS

PDF

39.8 KB Created: 2020-08-26 04:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40e69a824bb310a3bc5fdcb2d4a5b857 SHA-1: 0497216259b5b77f615997f5ae868c1f608cec3d SHA-256: 801217981b6d59eabcb62f46918526889f0967973b7f7d67c6f4551523b631ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one prominent link pointing to a known malicious redirector. The document body, though garbled, includes the target URL, suggesting an attempt to trick users into visiting malicious infrastructure. The ML classifier strongly indicates malicious intent.

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.com/pify?keyword=1+hectogramo+a+cuantos+gramos+equiva
    • http://luderadej.farmarik.com/uploads/1/3/1/4/131438541/xexavojizo.pdf
    • http://dojurebi.thedustinnulfteam.com/uploads/1/3/0/7/130739783/jifijelo.pdf
    • http://files.itsallabouttherealestate.com/uploads/1/3/1/3/131384635/vivifo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/gutazofeku.pdf
    • https://cdn.shopify.com/s/files/1/0432/1456/9632/files/27887430991.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/gepokododufeku.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8239/files/xenudekir.pdf
    • https://cdn.shopify.com/s/files/1/0454/3774/7358/files/fonofenuzunakopofu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/warframe_synthesis_target_locations.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/index._php_template_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/37413872646.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/sobibefakufobimofemera.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/zipapul.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/behaviourism_in_language_learning.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7805/files/como_transferir_backup_ios_para_android.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_off00005b34.bin
dd71de4f42941004a50e40e819ab885c549abb27c480e26d020645b4493e7a26
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B34 5324 bytes
font_01_sfnt_off00006d33.bin
77d6526f2b00cfa52326d55b88c0a2c76015d2079ab09047c32eac8b1fefe8b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D33 11404 bytes