Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e102f0691a1d3e7…

MALICIOUS

PDF

42.9 KB Created: 2020-08-20 03:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bae7041ca18979389e67571eaaa22791 SHA-1: 4c214a39af9bcceb741e3ccb6338c137a3f048de SHA-256: 6e102f0691a1d3e7481a3aea810c4e66ddeacced7ea90d6113196c35acf50afc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'cooking guide' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a link farm points towards SEO poisoning or similar distribution tactics.

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=hark+gas+smoker+cooking+guide
    • http://files.sapir-forum.org/uploads/1/3/1/4/131483603/gilam.pdf
    • http://files.abc-vermontnewhampshire.com/uploads/1/3/1/3/131383743/padugiluw.pdf
    • http://posujaxi.17southband.com/uploads/1/3/0/9/130969723/raxikumudagas_dejajoni_jerawezug_giguzuvikopuw.pdf
    • http://files.thelewisartgallery.com/uploads/1/3/2/7/132740838/9044599.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/94096607266.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/chrome_android_taskbar_bottom.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0590/files/icloud_login_finder_3._0.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/17933591202.pdf
    • https://cdn.shopify.com/s/files/1/0428/7702/6463/files/kofimixubowivagodevuvuwil.pdf
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/85523560232.pdf
    • https://cdn.shopify.com/s/files/1/0432/2043/5112/files/vaxutituvixax.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4847/files/automatic_irrigation_system_using_microcontroller_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/how_to_string_a_lacrosse_head.pdf
    • https://cdn.shopify.com/s/files/1/0445/1673/7183/files/kurirapona.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_off00006a4a.bin
ff0a8fbb8be38bba6a9197fc8e5aec5f3d8f8ca6c1f315cd3a650c4d4f76d7b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4A 5252 bytes
font_01_sfnt_off00007c10.bin
bb4af3d1e0aac28b29bafdd12dadf0a5a7389bd36b8d328bd0efa23f88ed4c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C10 10288 bytes