Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f583c669d84fbe…

MALICIOUS

PDF

69.3 KB Created: 2020-07-08 17:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fab522c9bfc5b636cb6dd2f793acbc84 SHA-1: 0334e108d7fc0fe4f3014b6050e63cd15f76c3b6 SHA-256: 96f583c669d84fbef221f0aade1df9f1a2e77eccfa50a1e137913b1f622a955a
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 seemingly generated PDF files on various domains. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier strongly indicated maliciousness. The document body, though partially obfuscated, contains the same lure text and URLs, suggesting a coordinated effort to drive traffic to potentially malicious or phishing sites.

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/wb?keyword=adjective%20list%20with%20bangla%20meaning%20pdf
    • http://files.soulsai.studio/uploads/1/3/1/6/131606550/46d94.pdf
    • http://files.wildcrumb.com/uploads/1/3/2/8/132815172/vevoxibejad-leroxiwu.pdf
    • http://files.ferryport.org/uploads/1/3/0/9/130969386/figusidijemikifesi.pdf
    • http://files.grettawilson.com/uploads/1/3/1/4/131437351/5306487.pdf
    • http://files.thirdcinemaproductions.com/uploads/1/3/1/3/131379749/sonazez.pdf
    • http://files.vertexprofessionalpainting.com/uploads/1/3/1/4/131406295/fbb4346ebf.pdf
    • http://files.arlingtonlimoco.com/uploads/1/3/1/1/131164351/jemodu-limifopetaluvo.pdf
    • http://files.texashollandlops.com/uploads/1/3/1/3/131379371/7953459.pdf
    • http://files.biggsbassethounds.com/uploads/1/3/1/8/131857071/84fb7a2093dbc.pdf
    • http://files.zanyunoodles.com/uploads/1/3/0/7/130739381/sikete-wemotuta.pdf
    • https://jasigib.files.wordpress.com/2020/07/vajexifusowuxusakod.pdf
    • https://lezikij545326841.files.wordpress.com/2020/06/kidalozetipoxanupe.pdf
    • https://bunazixuvavu.files.wordpress.com/2020/06/xewegezogevaveferu.pdf
    • https://surefab.files.wordpress.com/2020/07/69604696945.pdf
    • https://talujudi.files.wordpress.com/2020/07/20276920976.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sovir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90379225571.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.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_off00008bc3.bin
bbd43435c1f167be7c84cdffa037e8689394d2d0b08d3b1b991266c27e66b210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC3 5508 bytes
font_01_sfnt_off00009e60.bin
be7f6bd8ac8cbbc1468bd5ea36f2f6b742029c5ab475a0cd7a6873fcdec7aec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E60 22876 bytes
font_02_sfnt_off0000d842.bin
6c55aeaaf56c1f80d402a09bda052eb6e482b3a706e5a8dbb38c4ea12b46a550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 16156 bytes

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