Malicious PDF — malware analysis report

Static analysis result for SHA-256 058f92dc3d28807b…

MALICIOUS

PDF

41.3 KB Created: 2020-08-17 00:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a5b825dca17e6cbe8a09085252edfa2 SHA-1: 0689a0956794b665f35c46bf3850f9adc015abd0 SHA-256: 058f92dc3d28807bc2994a58e33815eee473f237a4cbdc5e26543eac5a95975b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, masquerading as a resource for 'codingbat answers python logic 2'. The primary link directs to a known malicious redirector, indicating an attempt to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that this is a phishing or redirection attempt.

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=codingbat+answers+python+logic+2
    • http://files.paulinedodd.com/uploads/1/3/1/3/131384656/papamifetavivav-wukafe.pdf
    • http://files.cashforgoldwc.com/uploads/1/3/1/4/131407767/646823.pdf
    • http://files.kinderstubepreschool.org/uploads/1/3/1/3/131383924/sufugakibunakenijemi.pdf
    • http://files.dakotacustombuildersllc.com/uploads/1/3/0/7/130775150/454a27ed4.pdf
    • http://files.bamfordgodfrey.com/uploads/1/3/1/3/131383720/a47169da553b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/83739543727.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/18205618103.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/ashrae_standards_62._1.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/rowopojopukosobalorugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7991/files/pozepowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/sixaxis_controller_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3457/files/15358219397.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/calculus_early_transcendentals_briggs_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/febewasuxeresi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/rijef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.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_off000055bb.bin
8c745dc32cce89a5746920d54a1d3977a7b1acb94f0ae4b6c6c85d78aa8296e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55BB 5708 bytes
font_01_sfnt_off00006936.bin
0bd28cea241268ef5c632bbb09227a0cd55bb2f168bcc3a619c9baa519593c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6936 15052 bytes

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