Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5590e96711da9b…

MALICIOUS

PDF

40.5 KB Created: 2020-08-16 11:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4375f0c99d8c58a72ca5f8b2da3fcdd SHA-1: db2b7c7b9e3b5f5c95d2655e9e5bab6a57f5445b SHA-256: bb5590e96711da9baf8270ffc18f7943935666f8da77f8a7f81225488de5e02c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link farm. One of the primary links points to a known malicious redirector. The document body, though heavily corrupted, contains the same redirector URL and a reference to wkhtmltopdf, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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 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=android+autocompletetextview+dropdown+padding
    • http://files.busybeeorganize.ca/uploads/1/3/0/9/130969004/gojebifazalomo-maxurapokenoxo.pdf
    • http://visosasej.mayflowerofbillings.com/uploads/1/3/2/6/132681072/229001.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/ayyappa_swamy_telugu_songs_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/60063089415.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/13293325429.pdf
    • https://cdn.shopify.com/s/files/1/0434/7448/5401/files/ascia_anaphylaxis_action_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/contaminacion_atmosferica_libro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0438/5082/5893/files/dire_straits_brothers_in_arms_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/16110509608.pdf
    • https://cdn.shopify.com/s/files/1/0433/8283/3308/files/wukelid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/espao_morto_anatomico_e_fisiologico.pdf
    • https://cdn.shopify.com/s/files/1/0438/2146/5757/files/gufoborotatuwof.pdf
    • https://cdn.shopify.com/s/files/1/0448/1181/3015/files/el_aleph_paulo_coelho.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_off00005ac0.bin
1cf5667938c335d04c55c6b906d1427a55c59ffe3d05ed8f97a691a367031d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC0 5424 bytes
font_01_sfnt_off00006d2b.bin
9e3195af36639a77329fb627b4fb1acda926917d040c57252ef3b1c872025f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2B 12220 bytes

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