Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb7b4a15ecdef04…

MALICIOUS

PDF

48.7 KB Created: 2020-08-09 06:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27393b067ed2e19afd001278fa030687 SHA-1: 170eb3c083e838ce6e60aa2373f7bb9f08ca79c6 SHA-256: 3bb7b4a15ecdef04a5a7d338dd1fe00859382fdecba90d06632b8749dee56f30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, https://ttraff.ru/pify?keyword=alternative+dispute+resolution+pdf, is identified as a malicious redirector. 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 tactic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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=alternative+dispute+resolution+pdf
    • http://files.planahenparty.com/uploads/1/3/1/0/131071290/3956101.pdf
    • http://files.2425york.com/uploads/1/3/1/3/131379951/nupetuvenabe_litepofu.pdf
    • http://files.barrvillemc.org/uploads/1/3/0/7/130776118/423244.pdf
    • https://cdn.shopify.com/s/files/1/0433/8024/4643/files/capital_market_reforms.pdf
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/pozab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/ser_bachiller_preguntas_y_respuestas.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/83815082915.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/fuveg.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/35867692369.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6150/files/override_bootstrap_css.pdf
    • https://cdn.shopify.com/s/files/1/0437/7211/7141/files/dojufodenumugadigido.pdf
    • https://cdn.shopify.com/s/files/1/0434/5770/8185/files/68504758224.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83260340608.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_off0000812b.bin
810f3792a7fad27055c074072d04203767b15b5e4404fcd50ac593cee5a1a458
pdf-font-stream PDF embedded font (sfnt) at offset 0x812B 5084 bytes
font_01_sfnt_off0000928d.bin
b55d0a938a9a5c6c0a3926236f6be222ae4f123ada33a5cab53590764386caf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x928D 10572 bytes