Malicious PDF — malware analysis report

Static analysis result for SHA-256 830ec65782ef4b66…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 20:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00d5bc1b1455961870f8a43d66493cd5 SHA-1: dae10367c06c5cc74677039cdf95905b04ab4d0a SHA-256: 830ec65782ef4b66774c1e4e4f2cc41d37c192c494a4fa7ccc2f364061fac50e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL and benign-looking PDF filenames, suggesting a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=english%20practice%20worksheets%20for%20grade%205
    • http://files.sanmarinogirlscouts.com/uploads/1/3/1/4/131482953/xumilufefi-ditobebu.pdf
    • http://files.jenracine.com/uploads/1/3/0/8/130874658/metefikijijip-sawuzob.pdf
    • http://files.lollipopsisters.com/uploads/1/3/1/4/131454984/8910647.pdf
    • http://files.windsormontessorischool.com/uploads/1/3/2/6/132681501/datafe_pogumavolabe_tuguxuzav_femokanigogedif.pdf
    • http://files.mmzurita.com/uploads/1/3/2/6/132682335/f729c23.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1036/files/civic_education_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/icasa_act.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3359516262.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.pdf
    • https://cdn.shopify.com/s/files/1/0433/5520/9879/files/vafamiparapesakamuvojoduv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/38005115635.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/wamolawupivaxas.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/nomago.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/lofalu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1527/2605/files/23390277879.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644d.bin
8e95049167a191f69a261d1e957e97c7a921601fe38672c06edda512f933f854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644D 5652 bytes
font_01_sfnt_off0000779f.bin
10b54dc4cdec4fcbdceffc28c005caeb959a195589a20f83b489f9bdee042b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779F 9968 bytes

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