Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d63b67231d6fa3…

MALICIOUS

PDF

32.1 KB Created: 2020-08-20 20:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a9ce127ea1f25e3e664b6b37ccbdfd SHA-1: 51c94ae444052eded4e2d83174bcac39aaac8979 SHA-256: 93d63b67231d6fa31f98750ec1bb0d03376380b074541e2433c6f8183a063ac1
128 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=staying+safe+at+home+worksheets'. This URL is presented within the document body, disguised as a worksheet download. The document also contains a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning attempt to mask the malicious redirector. No scripts were extracted from this sample.

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.com/pify?keyword=staying+safe+at+home+worksheets
    • http://juzivoriz.sdsusvo.org/uploads/1/3/1/1/131163559/7e200b3d.pdf
    • http://zosobaf.atcofootdoc.com/uploads/1/3/1/3/131398054/kubesateb.pdf
    • http://xozezaxi.thechildrenfirst.org/uploads/1/3/0/9/130969090/tiwokojepesox.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/rubokeviduru.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3396/files/revista_boticario_ciclo_18_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/towisutulamukowozumuwupuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5629/0206/files/affirmative_formal_command_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/number_line_to_1000.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/petix.pdf
    • https://cdn.shopify.com/s/files/1/0428/7388/0739/files/lujeloninule.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43034806536.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7293/files/gozelikuvajetog.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/sujovajarafawuma.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/american_standard_furnace_parts.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_off00004328.bin
40087067ffa1cc62947ca8ddfcbc1ce433d299df830534b19b5698ea36659004		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4328 5512 bytes
font_01_sfnt_off000055c9.bin
8acf3d0698f2296a5e21205d19f1f9fd61594aeb2069f548fbdadf2a51aa4d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C9 8812 bytes

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