Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1074bfd3f5104d…

MALICIOUS

PDF

60.6 KB Created: 2020-10-09 08:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3cbf50ea4ba707f6fc7e23cca0f5ec9b SHA-1: 58ae365eadeeb729bff948db57b1272c81dab14e SHA-256: 7a1074bfd3f5104d16e2afa117a828ccc10fe1810f51726a322f66625167965d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'gettraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning attempt. 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://gettraff.ru/pify?keyword=impressionistic+and+expressionistic+music In PDF document text
    • http://betesij.makingsiliconebabies.com/uploads/1/3/0/9/130969644/guravevufolewon.pdfIn PDF document text
    • http://files.leveluphealthandwellness.com/uploads/1/3/0/8/130813514/8372a5ff48.pdfIn PDF document text
    • http://files.arcofspringbranch.com/uploads/1/3/2/8/132815785/25d6d3042c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5912/5153/files/levolopogegotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6367/6580/files/seguribolulewumuzivukegox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0436/1884/files/95579421064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/72394885715.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7108/2148/files/mass_effect_missions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5bbf1e-2f81-48ff-ae51-56eb07eabbb6/53705758303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1907/4716/files/sikef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7753/2824/files/mainstays_4_drawer_dresser_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0698/3333/files/retinuvavu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1907/5221/files/sojepuberis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A69 5192 bytes
SHA-256: a4cdfb146ff3aad3f96c897b2e682af72458ae8b8ee7de0a3420980a40eeffd4
font_01_sfnt_off0000abfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFB 10504 bytes
SHA-256: b8eb5f8efc625e9ce758a487e1efe409a4f9c37722204bca5395b4b583ea5083
font_02_sfnt_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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