Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eef8b164f389cc5…

MALICIOUS

PDF

43.7 KB Created: 2020-08-08 07:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f652bb8ec6368745c402b1c44ecdf3b9 SHA-1: ebbb34d18e580a3de56e8b92fc1636d591112ae3 SHA-256: 8eef8b164f389cc59598b940c5e065f96b2ed817d9d3ba2501be16df5fe5d97f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript and a critical heuristic firing for a malicious redirector link. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for a PDF reader, aligning with the 'SE_INVOICE_LURE' heuristic. The primary malicious URL, 'https://ttraff.cc/pify?keyword=lightest+pdf+reader+for+android', is likely used to redirect the user to a malicious site. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute the malicious PDF.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=lightest+pdf+reader+for+android
    • http://files.pathwayworship.net/uploads/1/3/1/6/131606174/2228182.pdf
    • http://files.theohanadivecompany.com/uploads/1/3/1/3/131380850/5339a97182b360f.pdf
    • http://tesije.republicoftexans.com/uploads/1/3/2/6/132682076/runatenegegorew.pdf
    • http://zabipa.motivcanada.com/uploads/1/3/1/3/131380600/a2d28.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/61317182314.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/etica_nicomaquea_politica_aristoteles.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/74348928141.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/54329148688.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/72158481518.pdf
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/alienware_area_51m_specs.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1474/files/2329431581.pdf
    • https://cdn.shopify.com/s/files/1/0436/0152/6948/files/pathfinder_scaled_fist.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/englisch_aufgaben_klasse_6.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/24291566870.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/strider_beverly_cleary.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/use_ps3_controller_on_mac.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c86.bin
1d670285d0017ad39b7fd8ed2627e5bcdef34ba4f87df88be9ab4f6b3040acea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C86 5212 bytes
font_01_sfnt_off00007e45.bin
13581d03236470beccfbb1f64f506ff1dcbf2f6ed985d463fec401e7f55b7f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E45 10400 bytes

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