Malicious PDF — malware analysis report

Static analysis result for SHA-256 08627449276d078f…

MALICIOUS

PDF

44.3 KB Created: 2020-07-09 14:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da445dc70f05bc9e0e1a6a47206ceda7 SHA-1: 1336f241e531c2f71a41edbf07b5ae1b476ecbfc SHA-256: 08627449276d078fe1bdfc3e9c021ee90dca9e97a8c644ebbe37d2d710dc8e09
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 malicious redirector and others forming a large link farm. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to direct users to potentially harmful content or manipulate search engine results. No scripts were extracted, but the embedded links are the primary indicators of malicious activity.

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/wb?keyword=much%20many%20esl%20worksheet
    • http://files.sd50dfl.net/uploads/1/3/1/4/131453198/8265784.pdf
    • http://files.thegirlsfromguantanamo.com/uploads/1/3/2/6/132681938/2217839fd6588e.pdf
    • http://files.flyzephyr.com/uploads/1/3/1/3/131398591/tadupiletokeg.pdf
    • http://files.vexsens.com/uploads/1/3/0/7/130775846/waforumuwanaxogudo.pdf
    • http://files.u-drain.ca/uploads/1/3/0/7/130739383/7b1840d95c.pdf
    • http://files.westfielddentalpa.com/uploads/1/3/0/7/130775942/bavef_kezujuwusuk_javexolizepun.pdf
    • http://files.krabidream.com/uploads/1/3/2/6/132681566/3285554.pdf
    • http://files.sfmwgc.org/uploads/1/3/0/9/130970016/ninavumadipa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gopisasiru.files.wordpress.com/2020/06/16212047353.pdf
    • https://duxugol.files.wordpress.com/2020/06/riverefunikosilogirow.pdf
    • https://tefizewu.files.wordpress.com/2020/06/vorodafo.pdf
    • https://jutufunenuk.files.wordpress.com/2020/06/wuwez.pdf
    • https://mobulozasa.files.wordpress.com/2020/06/vukojipafejekutu.pdf
    • https://nugejelibu.files.wordpress.com/2020/06/fuxog.pdf
    • https://wozokaju.files.wordpress.com/2020/06/pitomumatipi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vewurobafug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20011772627.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_off00007023.bin
a052c1289c90e930b35a4c941be4c8a3f7c6e50e5380d5dfa2adf14a3f1fb2fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7023 5136 bytes
font_01_sfnt_off00008188.bin
353d3e6ea79328112e59793d94897ead44567e80f3c5df3bdfa20e4d04d233d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8188 10200 bytes

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