Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec28f6e5fe50bd4…

MALICIOUS

PDF

51.3 KB Created: 2020-08-07 02:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2506dcf48261af7ec01ddc3a3d686994 SHA-1: ad4f8076ede4fb6b52f237732aa2d5f956f7564b SHA-256: 6ec28f6e5fe50bd40a7802d9fe5b32d4222eb6c77677ae3abea8b18df135b66f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link, 'https://ttraff.cc/pify?keyword=bushcraft+attitude+magazine+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the magazine and the malicious URL, suggesting an attempt to disguise malicious activity as legitimate content. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=bushcraft+attitude+magazine+pdf
    • http://files.fiveclays.com/uploads/1/3/1/4/131406086/seratomuj.pdf
    • http://files.thesacredmiddle.com/uploads/1/3/0/8/130874317/5b886ef9cf6.pdf
    • http://files.bestwoodmyanmar.com/uploads/1/3/1/4/131453998/8706778bf0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9140/9558/files/87367059578.pdf
    • https://cdn.shopify.com/s/files/1/0433/4940/9960/files/differences_between_arbitration_and_mediation.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/bomogobaguxizod.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/mipofupegavubizu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/samumugudesiligopozakudo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/davapakojasufuzutow.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4016/files/windows_xp_sounds_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/70647342024.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/nezarokonelasutuduba.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/xafelatelexudaxejidapovom.pdf
    • https://cdn.shopify.com/s/files/1/0437/4737/7301/files/el_caballo_de_troya_jj_benitez.pdf
    • https://cdn.shopify.com/s/files/1/0446/1517/2259/files/administrative_office_management_book.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008916.bin
64e748c6dc1c524cc8fea900748ef7e0ec18613c3dde13f7e0c16b17bec1c802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8916 5636 bytes
font_01_sfnt_off00009c26.bin
a5a335a7bc97df045c55666ea4736cddd59ac9315ee6d7d7b188faf39a715aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C26 10604 bytes

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