Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f804571f374faeb…

MALICIOUS

PDF

43.5 KB Created: 2020-08-12 22:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82d4a748c9869c6a7fa3579e1c077ae4 SHA-1: e4f3360aeb076ddec51525f097baadbeab06568b SHA-256: 4f804571f374faeb01ddc6e136a983b579f6fb879364ba9037ad191c24721121
128 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'add text to a pdf file online free' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous PDF links further supports the SEO link farm heuristic.

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.
  • 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
  • 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=add+text+to+a+pdf+file+online+free
    • http://pebine.tpched.org/uploads/1/3/1/4/131453870/jaxidute.pdf
    • http://zanemukog.g2barnhunt.com/uploads/1/3/1/0/131070487/goxerorirezubenudule.pdf
    • http://files.nealsehgal.com/uploads/1/3/1/8/131871535/xupufusab-vuvazowujoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/35177887452.pdf
    • https://cdn.shopify.com/s/files/1/0429/8761/8463/files/new_apostolic_church_doctrine.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/vefupulowegodopojomidoxib.pdf
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/andorra_la_vella_mapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/89329208033.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6264/files/power_amplifier_basics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/inheritance_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/2395981863.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c6a.bin
4edcb408439c82998b585ab608cfa2b3b350e6dc7fffc83722718e57b8ce70f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6A 4912 bytes
font_01_sfnt_off00007d2d.bin
d17037297b3db749cb647a8325e61187652e275dcdff4d373696db76bc909907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2D 10420 bytes

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