Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc8761326b1b5d3…

MALICIOUS

PDF

44.2 KB Created: 2020-08-02 04:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2871039e28b6420d5c827ab96690564c SHA-1: b6ae2d7282aab4581909f7cc15033390fb81809a SHA-256: 8fc8761326b1b5d3667eeb2e7cd455c81e974da8e89e916fded3d9ca0f5d33e5
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised with a lure related to Minecraft Forge. The PDF also contains a large number of links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the primary malicious activity appears to be the redirection to the ttraff.ru domain.

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=how+to+install+minecraft+forge
    • http://files.david-jones-society.org/uploads/1/3/0/8/130814642/dixagululekivex_tekixomixe.pdf
    • http://files.brydant.com/uploads/1/3/1/4/131406258/3255612.pdf
    • http://files.winequeen.net/uploads/1/3/0/8/130814132/mozitov.pdf
    • https://cdn.shopify.com/s/files/1/0431/2354/0124/files/26527805519.pdf
    • https://cdn.shopify.com/s/files/1/0446/4774/3651/files/git_revert_all_local_changes.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/nomoxinakugenoviriviniw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/61126534153.pdf
    • https://cdn.shopify.com/s/files/1/0430/6914/5241/files/pupejum.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4711/files/pudin.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/sodujazuvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/66462011304.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/9859382866.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/bewife.pdf
    • https://cdn.shopify.com/s/files/1/0429/0428/9439/files/international_comfort_products_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/pepomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/77955625573.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/77731197661.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_off0000701a.bin
7c6ff73ce6ad351616046717796ac1483e2584b99e63fd67180a83e8e0f81bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x701A 5252 bytes
font_01_sfnt_off000081f1.bin
4211089079d441b6cea546c9ef9449765791b490762c79df15bf22ecf301743d
pdf-font-stream PDF embedded font (sfnt) at offset 0x81F1 9904 bytes