Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5f148f3f70d303…

MALICIOUS

PDF

85.8 KB Created: 2020-08-08 12:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 123052a9e8df31fa3cdba02dc4968b85 SHA-1: ee57c725c34dcd65ea2888677f3b6d4f13226a50 SHA-256: cc5f148f3f70d303e218df6955ae10111795fca73564c368132b7abc6b214e38
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru', which likely serves as a gateway to further malicious content. Another heuristic indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute malware. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=anaemia+definition+pdf', reinforcing the malicious redirection intent.

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=anaemia+definition+pdf
    • http://files.southforkprovisions.net/uploads/1/3/0/8/130874091/9076708.pdf
    • http://files.marknuytkens.com/uploads/1/3/0/8/130874567/jabasores_reboputojon_kelaporuze.pdf
    • http://files.trebor-ts.com/uploads/1/3/1/8/131871690/4fa93.pdf
    • https://cdn.shopify.com/s/files/1/0437/5586/4213/files/11564573439.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6400/files/91148014322.pdf
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/pdf_to_dwg_converter_zamzar.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/allah_names_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0437/3017/4113/files/baunvo_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/9708853745.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1251/files/41428460544.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6600/files/transnet_employment_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/gasosarubopatoxuxiwovofa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6550/0060/files/16916060812.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10542261424.pdf
    • https://cdn.shopify.com/s/files/1/0430/4551/9513/files/lobekusawosen.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/72527815698.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_off0000f948.bin
3b1a6714b5cc5554bc62dd3abdce5d0953955f058f5b1ba07b49c46d2a329bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 4656 bytes
font_01_sfnt_off00010903.bin
2c3fbbcf2b79e31727631b8bc4b8aacf7266dda69a595a99e0e9e78d0ebfb924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 16348 bytes
font_02_sfnt_off00013c1e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 4324 bytes

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