Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e098c9e0b5dfab…

MALICIOUS

PDF

45.4 KB Created: 2020-08-04 06:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cb113a7c61f33df80954e40e3b1b868 SHA-1: 4e18f4648f9f8750bd77cbbc2f3ac9b4b732e009 SHA-256: 05e098c9e0b5dfab09fc75be7a904713bb51297a0be93f68c2a70d87d2d32148
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body text, though garbled, includes the URL "https://ttraff.ru/pify?keyword=ethical+hacking+books+in+tamil+pdf", suggesting a lure to download or view content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to redirect users to potentially harmful sites.

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.ru/pify?keyword=ethical+hacking+books+in+tamil+pdf
    • http://files.thomaslhiegel.com/uploads/1/3/0/7/130775245/1492316.pdf
    • http://files.avsyum.com/uploads/1/3/0/8/130813100/32725f48bcd05.pdf
    • http://files.annahovet.com/uploads/1/3/2/3/132302858/xevoxiz-dudibugunet-nazedegeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/74072948947.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/89570380848.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/html_to_php_7.pdf
    • https://cdn.shopify.com/s/files/1/0437/1673/9222/files/xivegobikov.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/10030254739.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2193/files/zekisazuduzaxafetizuwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/426174872.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9434/files/28134197946.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/fojarajinegeputeturo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8389/6734/files/86716154113.pdf
    • https://cdn.shopify.com/s/files/1/0434/1668/2663/files/2746928238.pdf
    • https://cdn.shopify.com/s/files/1/0435/6594/0904/files/dogoxux.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3029/files/bunkie_test_espaol.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_off00007297.bin
39a675e07852f452563390d33020055d8138ebe09d24431bba3372ce38fcf029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7297 5636 bytes
font_01_sfnt_off0000859c.bin
e60000878c6fc3b1de427335f9638af65b5f533752b59306c81ec8cae608380b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x859C 10292 bytes

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