Malicious PDF — malware analysis report

Static analysis result for SHA-256 3615fc750be41765…

MALICIOUS

PDF

66.9 KB Created: 2020-08-25 16:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f159f364d6794f71dd8b12d2ca830d4a SHA-1: e1b43d9a46eb0b2ed61fc17054f7e36c25f8bfd6 SHA-256: 3615fc750be41765afa6813486b5f019944c7c2782d7d8efd148e2033c0d87d9
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as 'grammar worksheets for grade 5 icse'. The document body, though heavily obfuscated, also contains this URL. The presence of multiple embedded links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=grammar+worksheets+for+grade+5+icse
    • http://mivute.676kittyhawk.com/uploads/1/3/1/0/131069935/7278050.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5842/files/arminianos_y_calvinistas.pdf
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/89763167040.pdf
    • https://cdn.shopify.com/s/files/1/0437/9846/2624/files/fineb.pdf
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/75757840170.pdf
    • https://cdn.shopify.com/s/files/1/0436/0116/6498/files/12920581859.pdf
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/81501113472.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/59376864984.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/business_and_commercial_awareness.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_off0000c891.bin
a7bc2a56c053d051fdf42188af057e144508cc7143e5426ff72a7605ff100288		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 5716 bytes
font_01_sfnt_off0000dbfd.bin
9083f96925f1d0dfb1234045f3a6baa00c42524e14efb4995ae360a308b5e7c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 10200 bytes

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