Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bc88bf48f55b72…

MALICIOUS

PDF

49.9 KB Created: 2020-08-07 23:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5cadc8f67395800d864e304996a2fe0 SHA-1: d596fcc9b2364d8a8ca4512d12e37aaf617a4ec0 SHA-256: e6bc88bf48f55b72dd9ce97ce5a448a0858ad8370cae4549a930db893545e76e
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify domains, but one critical link to `ttraff.ru` is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting the primary intent is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=academic+literacy+test+pdf
    • http://bopamo.ladse.org/uploads/1/3/2/7/132740214/kamotetamitesejonu.pdf
    • http://wipetaxas.valkyriefineart.com/uploads/1/3/2/6/132695306/2b848e8e.pdf
    • http://files.greatgardenalternatives.com/uploads/1/3/0/7/130775953/3085928.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/mathematics_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/47828790776.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1690/files/gilipajijizu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/tesuvu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8039/8486/files/43337353422.pdf
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/carmen_bizet_habanera.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2995/files/zegepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3139/5493/files/87555628929.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2092/files/legislao_sobre_administrao_pblica_angolana.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/xidavule.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/class_11_chemistry_book_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/seginodulejejavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/77311129836.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/97525088607.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000746d.bin
8cd3a81cae9ed9bc246e6e39d752fbfcf767ca955b4a18be3e82972c8ad32895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746D 4964 bytes
font_01_sfnt_off00008555.bin
57967c25eee62e01be01fec778025c6c08e0924d5eca02042cfcc5e3786598cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8555 11828 bytes
font_02_sfnt_off0000ac9d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9D 4324 bytes

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