Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b36bfb606ccdcc…

MALICIOUS

PDF

47.7 KB Created: 2020-08-06 16:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3878e5504695373414406d7e01adfb96 SHA-1: e1d1402ed3d2764ae43857f84e73499e3e1807ce SHA-256: c3b36bfb606ccdcce0025e680dab315e1c1e23663cab3eca1c6b8184f2113c43
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the text 'Maths tricks for aptitude test pdf' and the malicious URL, suggesting a lure to trick users into visiting the redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=maths+tricks+for+aptitude+test+pdf
    • http://files.bijantaghavi.com/uploads/1/3/1/4/131407977/473403.pdf
    • http://jekaz.sharpfacetsgallery.com/uploads/1/3/1/1/131164243/sulitin_pewogodedavameb_vijekoribatoz.pdf
    • http://files.aaronchamberlain.com/uploads/1/3/1/4/131437984/3933139.pdf
    • http://files.avrilvandermerwe-create.com/uploads/1/3/1/3/131398222/2565664.pdf
    • http://files.dynamicathleticcenter.com/uploads/1/3/1/0/131071114/ruxajuv-tawarij-divuweno-vudiluxuxukime.pdf
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/zuzukoboganawijovavonu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3030/5175/files/bikugejefutizepezot.pdf
    • https://cdn.shopify.com/s/files/1/0438/0947/2669/files/favupisetisukipopubumeno.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/69042243516.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/synonym_for_for_example.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/84085884263.pdf
    • https://cdn.shopify.com/s/files/1/0433/3718/7493/files/45102050453.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/4194798941.pdf
    • https://cdn.shopify.com/s/files/1/0437/7765/4935/files/argumentation_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/dalwood_spelling_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2472/files/gexozovoxapezuvoboxin.pdf
    • https://cdn.shopify.com/s/files/1/0429/4498/7292/files/pokemon_red_guide.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072e7.bin
f04e43cc247353883a5c7e825aa51b087cba61fc5fee799c53d697465c0c973e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E7 5280 bytes
font_01_sfnt_off000084de.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DE 1800 bytes
font_02_sfnt_off00008d6c.bin
60bb80ef23648f09216afadec76f475f71dd0aa0f1d630cdb9965af332649385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6C 10492 bytes

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