Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f03cc81444bc49a…

MALICIOUS

PDF

50.1 KB Created: 2020-08-22 13:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97d88e8c0a29117b25ee8310fdd34c28 SHA-1: 91f9cdfcdca82797741d065891da655edee0518f SHA-256: 5f03cc81444bc49a64f060eec65c7d61b81887a27a83353f88b44e06e99212e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure or link farms. The primary malicious link, https://ttraff.ru/pify?keyword=sorting+algorithms+cheat+sheet+java, suggests a lure to a site that likely hosts further malicious content or phishing pages. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm.

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.ru/pify?keyword=sorting+algorithms+cheat+sheet+java
    • http://ralurusi.mentalhealthjunkie.com/uploads/1/3/0/7/130775940/1767525.pdf
    • http://files.afmxschool.com/uploads/1/3/1/8/131871705/burujosegir.pdf
    • http://files.globalevangelisticministries.net/uploads/1/3/2/3/132302759/7891151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4093/0968/files/33330524387.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0210/files/pdf_split_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/20653488404.pdf
    • https://cdn.shopify.com/s/files/1/0440/8927/8616/files/automatic_transmission_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7201/files/tunnelbear_vpn_apk_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/batinanidoxixiwerijiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2421/0326/files/16720541674.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/42093746484.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/65861856959.pdf
    • https://cdn.shopify.com/s/files/1/0441/1781/9544/files/shin_chan_tamil_video_hd.pdf
    • https://cdn.shopify.com/s/files/1/0432/5074/5512/files/xotajepened.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_off0000606c.bin
f77db264eefb1d7e41beb0e79cf1fc29ba3038d511e379f69639a2c0431bc74f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606C 5452 bytes
font_01_sfnt_off000072cd.bin
e90cd73e89e7f7007060bf2717022da3c08fa6fca62a144535cd2b5f3cdb57cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CD 16576 bytes
font_02_sfnt_off0000a513.bin
b363c4eac1e556b805637b4049b39081308579f78cdac206795c65238dc9a932		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA513 16500 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.