Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e90f0e04065d81…

MALICIOUS

PDF

57.2 KB Created: 2020-08-29 22:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254b052769bad54d8682abbf902eab70 SHA-1: 3713b0e050bce59b510c42211ca42e30406bc01c SHA-256: f7e90f0e04065d81b2b66135b0fcfe2c14ef68af51acb73a7d2994046b18dcb1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.com/wix?keyword=free+segy+seismic+data'. Additionally, a PDF_SEO_LINK_FARM heuristic indicates the document is part of a link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zozaweguxilamefawe.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'free segy seismic data' and the redirector URL, reinforcing the lure.

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/wix?keyword=free+segy+seismic+data
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zozaweguxilamefawe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/beechcraft_duchess_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1792/files/56227264045.pdf
    • https://cdn.shopify.com/s/files/1/0439/9074/5246/files/28022799729.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21154843933.pdf
    • https://cdn.shopify.com/s/files/1/0432/6794/8708/files/ajax_get_data_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/78951495918.pdf
    • https://static.usrfiles.com/ugd/ac51ce_4092f7c0c7b840ff9d0f575c35ce1720.pdf
    • https://static.usrfiles.com/ugd/1cfe37_d458656441314c9bacf056a5ac547b09.pdf
    • https://cdn.shopify.com/s/files/1/0461/9495/0295/files/wudavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/solegirobaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56325204281.pdf
    • https://cdn.shopify.com/s/files/1/0438/3693/2253/files/el_libro_verde_de_la_bruja_solitaria.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/
    • https://static.usrfiles.com/ugd/ac51ce

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009553.bin
12061e276247e23c214e2007187bc7dca6ef4618359a1db8981b97a8e738e8df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9553 4856 bytes
font_01_sfnt_off0000a5d4.bin
b4c1fcb445f38a40749add7fdc700bfdff09d33d3ff836d84a33159f3ea19092		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D4 10532 bytes
font_02_sfnt_off0000c9cf.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 4324 bytes

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