Malicious PDF — malware analysis report

Static analysis result for SHA-256 179eb4d285bbf5b7…

MALICIOUS

PDF

49.0 KB Created: 2020-08-23 16:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ac82ecf0872c3f385ca5028692455f5 SHA-1: f3390c71549c25f1b337545717d249ae8575cb55 SHA-256: 179eb4d285bbf5b7755b2ba8cdfab5e797d6458c27d0971d5c15cb9e5559e33b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs.

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=limited+liability+partnership+agreement+template
    • http://files.seacoastphn.org/uploads/1/3/0/7/130738675/952144.pdf
    • http://nawemoru.denisegnorris.com/uploads/1/3/1/0/131070374/durezewejomog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0826/1276/files/malaria_prophylaxis_guidelines_nepal.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/38879138489.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6103/files/lubetukelezigeraxukisove.pdf
    • https://cdn.shopify.com/s/files/1/0428/5199/1719/files/windows_media_creation_tool_win_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5329/files/43264599671.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/31977668434.pdf
    • https://cdn.shopify.com/s/files/1/0461/8459/5610/files/49392837844.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/puxipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3991/5164/files/dufonakekiximaxumoxulowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8515/1910/files/30040449562.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/folawowomole.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/7054194595.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_off00008082.bin
afdd204d180b455f217bfe6fd3a46921c891733f94a8b2cd3cf3be7fe52cf922
pdf-font-stream PDF embedded font (sfnt) at offset 0x8082 5556 bytes
font_01_sfnt_off00009331.bin
28d518cc348dbced00d2bd6c9e64fed49bf0f2c3a566f5534c337927b83e9c66
pdf-font-stream PDF embedded font (sfnt) at offset 0x9331 10364 bytes