Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbf4d9b9a346fcf…

MALICIOUS

PDF

47.6 KB Created: 2020-08-19 00:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c90fac6d8133d804c880fdc53b036fe4 SHA-1: dd0225528545f0bcf93b9a7a39b4e7198c7d2863 SHA-256: adbf4d9b9a346fcf968cc9a1c4ba399f8cdd95fbfe56cdf33c5d7a30449a363e
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, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=fishing+guides+brookings+oregon', is known to redirect to malicious infrastructure. The document body contains garbled text and a similar URL, suggesting it is designed to appear as content while primarily serving as a vehicle for link distribution. The ML classifier also strongly indicated maliciousness.

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=fishing+guides+brookings+oregon
    • http://virizov.laseraccents.com/uploads/1/3/2/7/132740405/wizapuvi-tujewad-rafiwa-vixerogadisoj.pdf
    • http://duxufag.hockleyliving.com/uploads/1/3/1/0/131070450/6912707.pdf
    • http://files.childwitnesstoviolence.org/uploads/1/3/2/6/132683069/3793318.pdf
    • http://files.lonegalloper.com/uploads/1/3/2/6/132681823/2fdf4b63.pdf
    • https://cdn.shopify.com/s/files/1/0435/5925/6225/files/carbon_cycle_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/6644543170.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mozinetesabelenigifil.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7417/files/bejutodapuwax.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/85034390760.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/61039361594.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/data_analysis_in_qualitative_research_example.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/7436315155.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/weekly_food_planner_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/2010_toyota_corolla_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/abnormal_psychology_in_a_changing_world_9th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/aid_and_attendance_form.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_off00006620.bin
52aecef92e3bb7654308ad8e1d0210c0d511c94e177a7dfd79c816e1566833c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6620 5004 bytes
font_01_sfnt_off0000770d.bin
5600687bf06338233b2ecc2d5efbf37980c6c31515f10722de1f380d3991a888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770D 10732 bytes
font_02_sfnt_off00009bf8.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF8 16092 bytes

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