Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c563c8e305ceaa…

MALICIOUS

PDF

40.5 KB Created: 2020-08-23 19:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd4808bebfa67e092dd3cf0f01fcb6fa SHA-1: af7528e2524389cb124ee571b53bf31bb04c71c1 SHA-256: e2c563c8e305ceaaace174161375bfcdea032b3cf18715a311d0bfbfb5e450cc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=author%2527+s+purpose+examples+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other Shopify-hosted PDF links, suggesting a link farm or redirection scheme. The ML classifier strongly supports the malicious nature of this PDF.

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=author%2527+s+purpose+examples+pdf
    • http://files.mwwc.net/uploads/1/3/1/4/131453022/lesarolirokujofob.pdf
    • http://files.davidpolito.com/uploads/1/3/0/7/130776049/3054611.pdf
    • http://files.airfiltersalesandservice.com/uploads/1/3/0/8/130813461/95f546a0.pdf
    • http://files.kimberlyandersonritchie.com/uploads/1/3/1/1/131164112/fasiribinipalopam.pdf
    • http://files.silvercreekelementaryschool.com/uploads/1/3/1/3/131379439/b4dda919.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/geometric_probability_distribution_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/briggs_and_stratton_5hp_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/94188825396.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.pdf
    • https://cdn.shopify.com/s/files/1/0435/0168/2843/files/a-_v_malformation_icd_10.pdf
    • https://cdn.shopify.com/s/files/1/0435/2724/1887/files/81420936017.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5871/files/westlife_flying_without_wings.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/34414688063.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/zerusuvawokazamareren.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/8637863278.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/dixufakazila.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f95.bin
6b4d9168d47f29528cc1ca484667614c085a9cec9df15f56b3bfbf06d74f9e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F95 5372 bytes
font_01_sfnt_off000071c2.bin
79ccfc72593a7804d243026adf1eec716dbc7d88c4c5f603f9eae86280fe32b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C2 10496 bytes

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