Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f82b1657e5af31…

MALICIOUS

PDF

36.1 KB Created: 2020-07-10 00:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5ce50a4e13efd9ea995ca42a8e974e8 SHA-1: b31cf0f3dca008ba1bb9630b5271574132b28360 SHA-256: b5f82b1657e5af31b451963e81749bfa280253af09afa9470a19ae03ac70297f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary link, 'https://ttraff.com/wb?keyword=impressora%20pdf%20foxit%20gratis', suggests a lure to download free PDF software, which redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized PDF links points to a link farm or redirection strategy to distribute malware.

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/wb?keyword=impressora%20pdf%20foxit%20gratis
    • http://files.kahaa.org/uploads/1/3/1/0/131070045/fobasume_zukujilerufe.pdf
    • http://files.changethenarrative.net/uploads/1/3/0/9/130969993/6226587e60.pdf
    • http://files.greentarafarm.com/uploads/1/3/2/7/132740418/zamanamulokuwexugure.pdf
    • http://files.tigerlillieunit.com/uploads/1/3/0/8/130813409/830927.pdf
    • http://files.traversehotham.com.au/uploads/1/3/1/3/131398220/785716.pdf
    • http://files.livinggodsmission.com/uploads/1/3/0/8/130874413/femobupowufebekoluta.pdf
    • http://files.frenetik.org/uploads/1/3/1/1/131164275/jadexefetifipigo.pdf
    • http://files.arlingtonmsband.com/uploads/1/3/1/6/131606087/ddee7.pdf
    • https://wisiseju.files.wordpress.com/2020/07/xavixekakupisejanito.pdf
    • https://vodefewosiru.files.wordpress.com/2020/06/65794477484.pdf
    • https://tomofezezoro.files.wordpress.com/2020/06/58352729742.pdf
    • https://pubixof.files.wordpress.com/2020/07/43546974596.pdf
    • https://zawigexirap.files.wordpress.com/2020/06/50074703611.pdf
    • https://burizifi.files.wordpress.com/2020/06/kidokenolo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duzibuwusupamodugibeboz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83759083977.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13164506765.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.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_off00004f9b.bin
89700769b98ea432ef8ea77c9085401b7266b07bcfa8883723f19ff5f5702b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F9B 5016 bytes
font_01_sfnt_off000060b0.bin
96879ed1daf841598d8bc480ec7cfe91100a0fa5048ef14c37c1692286f8ef9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B0 10184 bytes

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