Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3d9f2a4e29c572…

MALICIOUS

PDF

45.1 KB Created: 2020-07-30 04:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd3a283019c79373aebfdd248bfb7c0f SHA-1: 70fb85f7a0940685d8b0bdae43ccbff974154187 SHA-256: 7e3d9f2a4e29c572baf0709f2a55647a9e2f8ca6d8ab0dfdc7177dcd1a148978
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to known malicious redirector infrastructure (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'control mecanico y quimico de la placa bacteriana pdf'. The presence of numerous links to Shopify-hosted PDFs suggests a link farm or SEO poisoning tactic to distribute malicious 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.com/pify?keyword=control+mecanico+y+quimico+de+la+placa+bacteriana+pdf
    • http://files.fourcornerstack.com/uploads/1/3/1/6/131606762/podeba.pdf
    • http://files.castlebrooketlc.ca/uploads/1/3/0/8/130814129/diguvojix.pdf
    • http://files.steamboatbiblechurch.com/uploads/1/3/0/9/130969430/vedebisa-kononomi-bixifezigeguz-gamozet.pdf
    • http://files.alliancemasonryrestoration.com/uploads/1/3/1/3/131384250/saxixaxokisudow_fufigelumirupol.pdf
    • http://files.maxrhodesarts.com/uploads/1/3/1/0/131070207/xitefor_pelolixi_bajikim.pdf
    • http://files.castlebrooketlc.ca/u
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/gaxugeveg.pdf
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/58155252204.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/voxaxuzipotomop.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/ripodopupimizulo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5643/8165/files/susujibujalafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/90076071696.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/82329838210.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/foledixowasolo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129813.pdf
    • https://cdn.shopify.com/s/files/1/0436/2423/5170/files/21707772396.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_off0000734f.bin
2a553af1334e2e46ed26ed9e2378c820047cd6553f6f134502662f3be8e4763f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734F 5396 bytes
font_01_sfnt_off00008585.bin
921008848ad79a837b04beb8b4dde6d3e2476f6483b195298518f3c264b9c5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8585 9780 bytes

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