Malicious PDF — malware analysis report

Static analysis result for SHA-256 604f0c3772937a8f…

MALICIOUS

PDF

36.1 KB Created: 2020-07-09 19:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d5358c84fcc44600a5a9b352ed070ca SHA-1: b5e20ece5f7adcc707f8cb16cc51d02a9f68efad SHA-256: 604f0c3772937a8f92bcf93026766cbe6a9f70a12a15c6824909d4a2f8055704
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, directing users to various external websites. One of these links, 'https://ttraff.com/wb?keyword=negative%20prefixes%20worksheet%20pdf', is flagged as a known malicious redirector. This suggests the document's primary purpose is to redirect users to potentially harmful sites, possibly 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.com/wb?keyword=negative%20prefixes%20worksheet%20pdf
    • http://files.democrat.ie/uploads/1/3/0/8/130874018/zujide_duxokusa_gadevumepupi.pdf
    • http://files.lincolnfencecontractors.com/uploads/1/3/2/6/132681938/7c5f525598fb.pdf
    • http://files.valleyliberator.com/uploads/1/3/1/6/131606035/padavosagog.pdf
    • http://files.path2wine.com/uploads/1/3/1/3/131380875/aae37673f9.pdf
    • http://files.madlyeclectic.com/uploads/1/3/1/4/131483253/nuwitoduku_xafozovininu_lekilirox_navagad.pdf
    • http://files.christianjessup.com/uploads/1/3/2/7/132741045/tarusiwekapo-kudodeso.pdf
    • http://files.mhecblacon.com/uploads/1/3/1/4/131437351/vasak.pdf
    • http://files.godswaytshirts.com/uploads/1/3/2/3/132302815/7c24d7928c8eda5.pdf
    • http://files.theyogaschoolny.com/uploads/1/3/0/7/130775942/668541.pdf
    • http://files.sjhouse.org/uploads/1/3/1/4/131454158/gokoxebonuka_nidevafetosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zimoligedozo.files.wordpress.com/2020/06/94686995361.pdf
    • https://kakakudob.files.wordpress.com/2020/06/45160527705.pdf
    • https://dulevope.files.wordpress.com/2020/06/juwimerebofumaxovupeve.pdf
    • https://tanutukezod.files.wordpress.com/2020/07/liverowefizanuwejekejin.pdf
    • https://xoruwojuki.files.wordpress.com/2020/06/wimokopiz.pdf
    • https://sapofavef.files.wordpress.com/2020/06/xoxabaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/noviwuvado.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_off00004e8b.bin
7f40b4589a98697077937ead4465a505202a22bbf16964c784208aac3f747261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8B 5204 bytes
font_01_sfnt_off00006070.bin
7ef80b083875dcc12ee1e461a5a76d88e4a190ba0710adc301aabffa5133e269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6070 10284 bytes

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