Malicious PDF — malware analysis report

Static analysis result for SHA-256 133b023a455a2554…

MALICIOUS

PDF

233.5 KB Created: 2020-08-26 05:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16b16ba8bc3ec08b93be81bba342136 SHA-1: 075c9ba8d4a95d4f867db8116c60d7936eeb0bc8 SHA-256: 133b023a455a255419f1d8b93fdb0d53ed8109fdd66b0bc6e3c3ca554e3300b2
94 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for 'optician training manual free'. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=optician+training+manual+free
    • http://files.aclickawaytraining.com/uploads/1/3/0/7/130740149/d5adb46.pdf
    • http://files.earthconlandscapesupply.com/uploads/1/3/2/6/132696483/4facbc7f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/funuvotebez.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/zifonezodofipe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8815/0690/files/arterialized_portal_vein_waveform.pdf
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/jaxenirirud.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/jurnal_atresia_esofagus.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/cookiezi_new_skin.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/murofusozawivunexixabe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/vonomugesizapuferokowan.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/honeywell_pro_5000_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/flannel_sheet_set_queen_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0429/6094/5305/files/stephen_king_the_jaunt.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_off00035a9d.bin
57ffbed95c73c9377dcfad58baf6a8b071f342c353241e636dfe28dfe454e44f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35A9D 5184 bytes
font_01_sfnt_off00036c26.bin
6df844002a979581135deb86cf07f926a1d415340e5706843d1e967a2b0e95fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x36C26 13636 bytes

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