Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb01b73ac1e4a0c8…

MALICIOUS

PDF

48.0 KB Created: 2020-08-19 15:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f441e494bdad0aa29c80fed61b7f32aa SHA-1: 5d39b3dd2a291a1b43beb245db9a42ef8b5fb87c SHA-256: eb01b73ac1e4a0c83c7c117ebe01150d968154f3cc3e7c93827f6dfee44e6f9c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=sociologija+porodice+pdf', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains the malicious URL, suggesting a social engineering 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.ru/pify?keyword=sociologija+porodice+pdf
    • http://files.blueridgestitches.com/uploads/1/3/0/7/130738614/2623298.pdf
    • http://files.elevatedoralsurgery.com/uploads/1/3/1/3/131380158/gedosusixokijeg_nulig.pdf
    • http://files.nicolesbadassblog.com/uploads/1/3/1/6/131606092/9367138ecb1.pdf
    • https://cdn.shopify.com/s/files/1/0427/7587/1654/files/57709855009.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/measurement_of_variables_in_research.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/xaxesonakugixewemub.pdf
    • https://cdn.shopify.com/s/files/1/0435/2406/3392/files/alimentos_afrodisacos_para_homens.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/purewexajujipapa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/76322453328.pdf
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/pudofovabefuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/31156127382.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5284/files/bokeh_photo_editor_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7234/files/sukedibexopovigizes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6197/6994/files/guided_reading_worksheet_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/47930481972.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/stay_at_home_mom_resume.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://cdn.shopify.com/s/files/1/0434/5711/8374/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dcd.bin
c7a2b9d4ac5a991797075be428b0f316185b2f4c99db4e321085222ab2311b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCD 5324 bytes
font_01_sfnt_off00008fec.bin
a6241dcd0f526c86ab4361c6816374208d3a699a14eab62fc3bb9dcc225fd9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEC 10416 bytes

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