Malicious PDF — malware analysis report

Static analysis result for SHA-256 6396b16fd5a08fbc…

MALICIOUS

PDF

47.7 KB Created: 2020-07-08 23:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7fbe9c6181bfc44960fcf804643c5b8 SHA-1: c7c980127723c4b28f27496916aff05f88c568d2 SHA-256: 6396b16fd5a08fbc928c26d0e7a7e064861bb8e589407f3fd7c3008eb853d026
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to harmful content. The document body, though partially corrupted, contains keywords related to educational worksheets, likely a lure to disguise the 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/wb?keyword=area%20and%20circumference%20of%20a%20circle%20word%20problems%20worksheet
    • http://files.curetypeone.com/uploads/1/3/1/3/131380121/dadf492e7ec13e.pdf
    • http://files.bigoakfarms.net/uploads/1/3/1/6/131606280/jadepopa_mekolojo_susise.pdf
    • http://files.mhsrunningtribe.com/uploads/1/3/0/9/130969046/2af9b84d0.pdf
    • http://files.lakeareatidbits.com/uploads/1/3/1/3/131383383/e5e72f.pdf
    • http://files.l4designbuild.com/uploads/1/3/0/9/130969992/vojizit.pdf
    • http://files.corhartselle.org/uploads/1/3/1/4/131438150/c19fe1.pdf
    • http://files.pinegrovecogop.org/uploads/1/3/0/8/130874318/de351d21ce3806f.pdf
    • http://files.firstathens.org/uploads/1/3/2/7/132710687/9347935.pdf
    • http://files.pathsforwholeness.com/uploads/1/3/2/7/132741181/80770fca107baf0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fiwojinugir.files.wordpress.com/2020/06/51173552534.pdf
    • https://laxosuval.files.wordpress.com/2020/07/57501937153.pdf
    • https://wepubutapov523926748.files.wordpress.com/2020/07/4129168577.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b4.bin
6c1af8ed874c171e16d83c4c417150c3a23f2577e278064e4018d8f11dfb5542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B4 5564 bytes
font_01_sfnt_off0000766e.bin
a77bf87a0cf8aaff52895380f98f1efe239b56589fef1da0b53cb7692ac7f7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766E 10680 bytes
font_02_sfnt_off00009b26.bin
8fc4bdb6d230b8de5b4cd572f0ea9af8610b804e36dd471692395ea844a04b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B26 16324 bytes

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