Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4d8a0b1dce2acd…

MALICIOUS

PDF

43.2 KB Created: 2020-08-15 14:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2f8594540cb25a41f8eee79bf5de1c9 SHA-1: 5437b997e21ce3e38be54f5942817b812777c4d8 SHA-256: 6a4d8a0b1dce2acd8566cad055f232e6349b51a8ff248ac1499fdacbb01513a0
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'printable spelling worksheet for grade 3'. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=printable+spelling+worksheet+for+grade+3
    • http://files.donniebickham.net/uploads/1/3/2/6/132695339/xikatub.pdf
    • http://wuwex.alliance11.com/uploads/1/3/1/4/131455734/wujokesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/isometric_projection_in_engineering_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0438/5131/7408/files/automatic_track_guided_vehicle_agv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/39549037872.pdf
    • https://cdn.shopify.com/s/files/1/0436/8905/0265/files/26462973257.pdf
    • https://cdn.shopify.com/s/files/1/0441/2204/6616/files/waltz_for_debby_cannonball.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/51252282111.pdf
    • https://cdn.shopify.com/s/files/1/0433/6618/7167/files/mupubofefazobameja.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/fatebenefupipanixebepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0700/files/30931273591.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/71759969614.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/kesizuzamamulafemapidupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/62573853015.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/52014517065.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.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_off0000640c.bin
dc7ef65743fe16ebf92ee028cd824c87c39d961fefc8e6eabd729806585b9f36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640C 5764 bytes
font_01_sfnt_off000077aa.bin
27a7ee6caf9e1c68736332c9fcab535c3550acf47250da928470edd021f0d085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AA 11648 bytes

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