Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71754331cc935f6…

MALICIOUS

PDF

44.5 KB Created: 2020-07-30 08:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf025a1f2dabc71a1a9adb2bdc63bc79 SHA-1: ad99e542ae12fc1644fbdc32511dd74396af4c03 SHA-256: b71754331cc935f6b099e044d9f4f5ecf05ebcaf2b439ace07c94897398f828f
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Another critical heuristic indicates a link farm, suggesting an attempt to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The document body, though heavily obfuscated, contains text related to a textbook, likely used as a pretext for the malicious link.

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=class+10+english+language+and+literature+textbook+pdf
    • http://files.markspencercook.com/uploads/1/3/1/6/131606125/bowikedelijiban.pdf
    • http://files.rusticmtnart.com/uploads/1/3/1/3/131380875/teteruguxasa.pdf
    • http://files.cisairandheat.com/uploads/1/3/1/8/131871593/1008738.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/47918888835.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/difukemajakiwito.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/ralapowejitunefewowefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/92665151127.pdf
    • https://cdn.shopify.com/s/files/1/0439/0679/3627/files/7087327624.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/kuzokalabogolibekok.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/sugasokegagama.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/80564087387.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/88301624356.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/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fc9.bin
18bb4c0c407f56da4b2c378eed22f8bd5e92d0f713c8435c263c3f3730e2f55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC9 5672 bytes
font_01_sfnt_off00008304.bin
17593d777a6e60e94ae33fb3acc52be757bb31ca8ab3814705ec38ba11d23d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8304 9976 bytes

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