Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a47042eefb51c08…

MALICIOUS

PDF

39.9 KB Created: 2020-08-11 22:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe620a465ffe7aa78e137d740fbd873f SHA-1: 9487d5861d29a9a4900256b6b699b88e9dffbf49 SHA-256: 6a47042eefb51c08ed6c976d3d962cc70626741402f821d47cc3278bcd27a659
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/pify?keyword=algorithms+and+data+structures+made+easy+narasimha+karumanchi+pdf. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which points to a benign Shopify URL. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several other PDF links, suggesting a lure to download or access further content, likely 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.ru/pify?keyword=algorithms+and+data+structures+made+easy+narasimha+karumanchi+pdf
    • http://vopipenux.vetrehabcenter.com/uploads/1/3/2/6/132683328/9714677.pdf
    • http://files.vietnameravets.com/uploads/1/3/1/0/131070527/771ae.pdf
    • http://files.welostthemap.com/uploads/1/3/1/4/131454305/940be5742535f.pdf
    • http://files.bepowerpositive.org/uploads/1/3/0/9/130969402/7018831.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8497/2183/files/jitaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/63982821177.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/50270226243.pdf
    • https://cdn.shopify.com/s/files/1/0435/7786/8443/files/giwebegorabimevotuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9969/files/98924277574.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56697352128.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0469/files/35081757551.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/xiwuzufozidukatafurimigiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/1759/1191/files/annotate_windows_open_source.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/zineru.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_off00005cea.bin
30d66044f3152d9dfb5623ca65de734b712c789fca85894c3925144b22bc7f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEA 5724 bytes
font_01_sfnt_off00007047.bin
447197f853df6581ee000cf8014f5d5aa974fddd174c895eda9aac0a7cd3f3fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7047 10064 bytes

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