Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a19c57d672cd51…

MALICIOUS

PDF

37.0 KB Created: 2020-08-19 21:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb18767ce0d6d01fb368c744e3c4a2b9 SHA-1: 5bd8d3522d38563b0dce6809b773bbfc28352b0c SHA-256: e9a19c57d672cd51350e621f385112192c7547add9be9dff63659d51b668bddc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and multiple URLs, including the redirector and a large number of links to Shopify-hosted PDFs, suggesting a link farm or redirection strategy. The primary attack pattern involves luring users through these links.

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=sorboto+mongolo+radhe+binodini+rai+ringtone
    • http://rogobel.thegarbagefire.club/uploads/1/3/2/7/132740850/abbb02511.pdf
    • http://files.ronsgameroom.com/uploads/1/3/1/4/131437307/9234794.pdf
    • http://files.ottercreekcc.org/uploads/1/3/2/7/132741385/xevoxitulawolawejeb.pdf
    • http://files.fusaroconsulting.com/uploads/1/3/1/6/131637695/626c0bf616cdb78.pdf
    • http://files.abundantbehavioralhealth.com/uploads/1/3/1/6/131606289/8540223.pdf
    • https://cdn.shopify.com/s/files/1/0434/2045/0972/files/budgeting_profit_planning_and_control.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/moredizozemenojagasora.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/2511118985.pdf
    • https://cdn.shopify.com/s/files/1/0438/6576/8096/files/32559656481.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1066/files/annual_report_design_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/breath_of_fire_3_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0434/7609/1032/files/96770651814.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/fiseb.pdf
    • https://cdn.shopify.com/s/files/1/0440/9711/0168/files/android_camera_preview_screen_size.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048c4.bin
f5414b57e1a6fb7cbd60248be54fbfa748d95e04b307bc8138b39c68f6e066a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C4 5092 bytes
font_01_sfnt_off000059c9.bin
55579d5d4f5f0dbb3ea8eb2c43ddb4f2a91ba5b57752f8fdc0c42379ef1966a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C9 9084 bytes
font_02_sfnt_off000078f2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F2 4324 bytes

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