Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4026539b41a1d2…

MALICIOUS

PDF

44.4 KB Created: 2020-08-23 11:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd251edccbe3bfc3a6c31ff4346671bf SHA-1: b7c8596c5747e38df5eb84e933cdc5160bd0ec2c SHA-256: fe4026539b41a1d2105730dc5ad413eada4ee4a94c7295282a6e6e9a055245a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, disguised as a Chubb travel insurance claim form. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the redirection to known malicious infrastructure. The PDF also contains a large number of external links, suggesting a link farm for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of malicious links is sufficient evidence for the attack pattern.

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/pify?keyword=chubb+travel+insurance+claim+form+uk
    • http://files.bestdayeverevents.nl/uploads/1/3/1/4/131453539/bisizilitirekime.pdf
    • http://files.mindmeltgames.com/uploads/1/3/1/4/131453990/5178484.pdf
    • http://files.thepathclearer.com.au/uploads/1/3/1/3/131379894/7564d18c79927.pdf
    • http://xunevifup.decoratingwithgrace.com/uploads/1/3/1/0/131070858/9edade8cf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/tomb_of_annihilation_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/vifevexibufosunatiworap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0160/1444/files/schistosoma_mekongi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/queue_implementation_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/nuzurene.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/16607786115.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/trivium_ember_to_inferno.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2371/files/bawatexabogikanu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/nfl_week_1_schedule_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8975/6311/files/adobe_creative_cloud_update_failed_error.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_off00006d19.bin
6d42561bd2381a6df664024586a89be94d8c2e9b44801715d28ea1550856a2e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D19 5292 bytes
font_01_sfnt_off00007ef1.bin
adcba56424dc6f09e46d5e6676ff1f7f05e00aae896a4165c04ef813ec8dc95c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF1 11108 bytes