Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8a5a53c87fc648…

MALICIOUS

PDF

36.1 KB Created: 2020-08-12 00:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da14cb4ff26083f4a51803782954e4b1 SHA-1: d208ebf9c7fb04591c910aa81b59a50ab19f1f82 SHA-256: 6e8a5a53c87fc6480b7391b03a8ce9c9d14660123158c45eb1e32dfe7cc5f30e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or traffic-driving scheme. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs.

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/pify?keyword=telugu+bible+dictionary+pdf+free+download
    • http://nemodu.lincolnpsg.com/uploads/1/3/1/4/131453215/fokasiw_pifamexe.pdf
    • http://files.empowereddecisions.us/uploads/1/3/2/3/132303269/dfe0b.pdf
    • http://zogano.thearcsusquehanna.org/uploads/1/3/1/8/131856907/sasemuxobijadup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/learn_english_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/accounting_equation_problems_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/noxebuvekiwal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/complex_analytic_function.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/22422463196.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/access_iif_function.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/natanenasez.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/lawn_mower_spark_plug_gap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8103/files/administrao_estratgica_conceitos_wright.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/vesozagorupunixajifula.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/simple_recommendation_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/3619792864.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/gubodufakewawokuzasavuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0165/9043/files/22420506448.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_off00004d2e.bin
c27894ea4c171827cc5a8039abc1aedaa6d404e8f911201fccaeb5221a419926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D2E 5428 bytes
font_01_sfnt_off00005fc0.bin
684294dbf12d5640524835c5c731c9ec7df2c68492996c7f527df38dc85da70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC0 10740 bytes

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