Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a08d6fe62833b85…

MALICIOUS

PDF

44.8 KB Created: 2020-07-19 05:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1342d7853268bead190881147058a6d8 SHA-1: 625746ce2c1e9028bd7396fe5f071eb9e39a4983 SHA-256: 6a08d6fe62833b8584db804d2392c14abd634fbb9bc253ba33c3a8e7b030e8cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files. One of the primary links directs to a known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be a lure for users searching for educational materials.

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=venn%20diagram%20math%20worksheets%203rd%20grade
    • http://files.labrottiecreations.com/uploads/1/3/1/0/131070452/vizak_dogimowezin.pdf
    • http://files.ripmarkens.com/uploads/1/3/1/4/131409909/7335212.pdf
    • http://files.mylunchpail.net/uploads/1/3/1/3/131382239/zubosezapedi.pdf
    • http://files.karenstobbe.com/uploads/1/3/1/6/131606349/niwafonejupara.pdf
    • http://files.lindenfestil.com/uploads/1/3/0/7/130776296/82c752e18c2e.pdf
    • http://files.risingachievers.org/uploads/1/3/2/7/132741064/devupowaxosalaz-buwirase-lugewepajes.pdf
    • http://files.thesoulsalchemy.com/uploads/1/3/0/8/130814687/gonuror_jelegusugajo_gujisanolose_pugijuzepe.pdf
    • http://files.agentpgs-qatar.com/uploads/1/3/1/1/131164311/luvokedekasimubaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gavilot137689634.files.wordpress.com/2020/07/38291061937.pdf
    • https://dawileva.files.wordpress.com/2020/06/vajefaxewuk.pdf
    • https://vuwoloza.files.wordpress.com/2020/06/givapabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13503036424.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/tutiwirutejumevu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/kirabomirowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/firorake.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/18591576478.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/puxafexorelamuvivadido.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/63393332437.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/ferolajoxuxurogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/36140272788.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/nozoguju.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_off000071c8.bin
9aec1328207a2ec118b82014cdf762f66a3d6ce70798c3b9b30a8f0e6a2e3579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C8 5280 bytes
font_01_sfnt_off000083a2.bin
d732f007e541ec28585b7a180ee3b7c2a37907225ed5a45571bf95af007bc90d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A2 9928 bytes

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