Malicious PDF — malware analysis report

Static analysis result for SHA-256 1766aff9b07290a8…

MALICIOUS

PDF

48.3 KB Created: 2020-08-06 12:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 711ff2ff725c94e5b63b0cb93294f3ae SHA-1: 2d3bad6b532704b279a0125d8fe48666815eebf2 SHA-256: 1766aff9b07290a8917c9f20701cd492dd02a258006f93fea92188c98a4eb1ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is a strong indicator of malicious intent. The document also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=boost+your+self+esteem+pdf
    • http://files.eatdelirium.com/uploads/1/3/1/4/131453206/leponedujadigapusoxu.pdf
    • http://files.corktownstudios.com/uploads/1/3/2/6/132696351/2116729.pdf
    • http://files.ottertotsplayandlearn.com/uploads/1/3/1/4/131454272/a52f4f79547fb.pdf
    • http://files.newpathway.co.uk/uploads/1/3/1/8/131857049/8e26b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/tazaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/52772504420.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/63388364603.pdf
    • https://cdn.shopify.com/s/files/1/0435/2334/2495/files/92831921359.pdf
    • https://cdn.shopify.com/s/files/1/0441/2493/0200/files/karmasandhan_bengali_paper.pdf
    • https://cdn.shopify.com/s/files/1/0430/4486/4149/files/36162422390.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/pagujabufosomom.pdf
    • https://cdn.shopify.com/s/files/1/0435/4569/0261/files/xutatisatovexam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8283/3308/files/87782077272.pdf
    • https://cdn.shopify.com/s/files/1/0431/2783/2733/files/fubawuwagona.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/vibomurekowinokenojenabim.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/newadozovufitibuzavobo.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e89.bin
ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E89 6744 bytes
font_01_sfnt_off00007f71.bin
10b6eda1b27b5a624c1c0b668ab67da80b748fa7996832f7258c17b724ef1776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F71 5128 bytes
font_02_sfnt_off000090d8.bin
b6e413b9f34f8a48dd6d14f6d9b6fb9147b2a13f3e27958c7b6ee7bae4dcc3ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D8 10204 bytes

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