Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee1f56d5409874f…

MALICIOUS

PDF

42.2 KB Created: 2020-08-17 07:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa578a64039eb5c14932c83c2def7788 SHA-1: 03fa244d1fb71f7760e9ec630861db6adee849c5 SHA-256: 6ee1f56d5409874febe5aaf0030659579be8595467abfdeb72e966b3601730a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to potentially harmful websites via these embedded 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=english+vocabulary+body+parts+pdf
    • http://banukiju.hazardhealth.com/uploads/1/3/0/7/130776818/fd8561e07a40b.pdf
    • http://files.hannkhigg.com/uploads/1/3/1/4/131437626/2754201.pdf
    • http://wumabovi.holistichealthdiy.com/uploads/1/3/1/6/131637047/8647001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9163/9968/files/325265210.pdf
    • https://cdn.shopify.com/s/files/1/0429/8378/4601/files/2d_metal_carbides_and_nitrides_mxenes_for_energy_storage.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/excel_calculation_options_change_to_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/66041627676.pdf
    • https://cdn.shopify.com/s/files/1/0443/0381/0716/files/analects_of_confucius_quotes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/zafitenozibitepax.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/data_structures_and_algorithms_in_python_michael_t._goodrich.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5457/files/gofubiditufatebadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3466/4347/files/wolovaropagaxov.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/94628195133.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/80489693116.pdf
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/bokan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/45070984700.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_off00006623.bin
2468fa4d4c76dcc3109fb2f35dd602f4915ff97a4d0202bebc6342d5b7d43a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6623 5676 bytes
font_01_sfnt_off00007970.bin
4dbce8235530f608582f7eb0fe03311a11ec8984064ddeb396eea3ad235cda09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7970 10128 bytes

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