Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9a84a7f2b662e4…

MALICIOUS

PDF

42.5 KB Created: 2020-07-10 15:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 155391deeff2a1033809318f2b2e3f74 SHA-1: bb110aa20ab5145fcc66f7f192d6ca8504acdbc5 SHA-256: 8b9a84a7f2b662e45f9c1f83f8c70ec14581cf7f7c3a09e7f6d3df3204a560bb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to host other PDFs. One of the primary links redirects to a known malicious domain, ttraff.com, suggesting a phishing or malware distribution attempt. 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.com/wb?keyword=addition%20bonds%20to%2010%20worksheets
    • http://files.sudensuukon.com/uploads/1/3/1/4/131405977/jinaxad-masewexojoped-rukaj.pdf
    • http://files.acpnutrition.com/uploads/1/3/1/6/131637325/moviridu_lasal.pdf
    • http://files.portlandbuckaroos.com/uploads/1/3/1/4/131438150/2936062.pdf
    • http://files.drjasonwilliams.com/uploads/1/3/0/8/130873741/jabijesugumavo.pdf
    • http://files.californiasun.co/uploads/1/3/0/7/130739174/6d8d53e.pdf
    • http://files.alifeworthliving2.org/uploads/1/3/0/8/130874318/lenalaw-fowez-legojumafixixin-tunotababivofen.pdf
    • http://files.sandaharrboerboels.com/uploads/1/3/2/6/132681566/6896535.pdf
    • http://files.eastbayanimalhospitalseekonk.com/uploads/1/3/2/6/132695932/gunusezivev_rapavunazexo_vokinafapiw.pdf
    • http://files.merarifernandez.com/uploads/1/3/1/4/131407165/6839308.pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • http://files.columbiadentcenter.com/uploads/1/3/0/9/130969910/jubegonakajij-desagomabof-sateno-pikilolot.pdf
    • http://files.bellacalore.com/uploads/1/3/0/8/130814279/mumubimogamu-fupedevumebat-ropetiwajo.pdf
    • https://mamonuno.files.wordpress.com/2020/06/zikulorir.pdf
    • https://kupasexale.files.wordpress.com/2020/06/14497210597.pdf
    • https://mesimowe.files.wordpress.com/2020/06/gasevazuragoviliparulo.pdf
    • https://funofabo.files.wordpress.com/2020/07/jemerixawoloratokerel.pdf
    • https://xitesino.files.wordpress.com/2020/06/xuzilosasibovinobade.pdf
    • https://revujinule.files.wordpress.com/2020/07/20428472736.pdf
    • https://tukujefarepe.files.wordpress.com/2020/07/sasidolewun.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/32102083324.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/jibigodikutusumiwowujaros.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/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006918.bin
778a1b4ec4b5fc1ed1c6927d13fb8f108d521fab0ec033e4ede9d232a94ca744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6918 4936 bytes
font_01_sfnt_off000079e8.bin
8d1b6aca6c558339c6d60fb5f920ce658f63f200cbc4d4a08f252cd532f95f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E8 10044 bytes

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