Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d4a31b731c8a6a…

MALICIOUS

PDF

47.6 KB Created: 2020-07-20 18:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 059ee416ab50064a1ee4b3d37b7f1df9 SHA-1: c3f77d9a97a3a6a89e296f2ae27c4bcb47144c33 SHA-256: 64d4a31b731c8a6aba1f926343b28e932fdf3220ed83cdee9e7a2bf446990d4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious sites. The primary malicious URL identified is ttraff.cc, which is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to be related to educational worksheets, likely serving as a lure.

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/wb?keyword=100%20times%20tables%20questions%20worksheets
    • http://files.balancedforlifeyoga.com/uploads/1/3/1/3/131380005/satuve_xinesikujesuraj_xewapituboli_movekimowupaw.pdf
    • http://files.charlesfbond.com/uploads/1/3/1/4/131406153/vifetasiju_kamokek.pdf
    • http://files.stampexinternational.co.uk/uploads/1/3/0/7/130739383/zozewisibu_danenugoravinas_zibazoned_vinudi.pdf
    • http://files.ohionursepreceptor.com/uploads/1/3/2/3/132303134/f7272ccb05451f6.pdf
    • http://files.kekusa.com/uploads/1/3/2/7/132710786/kazal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/tubamizozogusozuborokarer.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/sizuged.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/tetugagemarilipalakit.pdf
    • https://rolinozopuj.files.wordpress.com/2020/06/wafiruzalanuzumifojeseka.pdf
    • https://fimesijonoba.files.wordpress.com/2020/06/namevolururomupejixud.pdf
    • https://lotodirod.files.wordpress.com/2020/07/gobiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6119/files/gilodimub.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/newizasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/fogefimewabebixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/46698098986.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/monazata.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/63086526189.pdf
    • https://cdn.shopify.com/s/files/1/0433/2630/8510/files/82455675110.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/49097523626.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rexalomofovuwazeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/75502225613.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_off00007c19.bin
cad96b7eecc3702b56ab76e870c09ec53ede01ac8745cf3ca98a6a3683ccfd3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C19 5328 bytes
font_01_sfnt_off00008e0f.bin
3c22824b0e1ecd8c249cd7fe61c1ed836f782b76b7471c5ef084634be6ba4b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0F 10104 bytes

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