Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dcdecd20a01770…

MALICIOUS

PDF

42.6 KB Created: 2020-08-09 09:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 935c1d9a64ef1e1ee4f7fad965d815b9 SHA-1: 182a6e6483784b7adb0d45f6a03b18f571a3c994 SHA-256: 28dcdecd20a01770c21939888972b02209319166760d72c7a7e8ae945439e341
120 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as a download for 'Advanced java interview questions pdf'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the primary URL, https://ttraff.com/pify?keyword=advanced+java+interview+questions+pdf+download, leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic suggests a large number of external links, many hosted on Shopify, likely to obscure the malicious redirector. No scripts were extracted from this sample.

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=advanced+java+interview+questions+pdf+download
    • http://zuber.onesweetbakingco.com/uploads/1/3/1/4/131407406/8b43c5087f5.pdf
    • http://files.thestadiumchasers.com/uploads/1/3/1/6/131636845/revebaridatisujomiwu.pdf
    • http://files.highlandtigers.com/uploads/1/3/1/4/131437515/wuxazeni.pdf
    • https://cdn.shopify.com/s/files/1/0432/4062/0200/files/24601146471.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/our_classroom_rules.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54903558396.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/33338242872.pdf
    • https://cdn.shopify.com/s/files/1/0430/6462/3265/files/besixotekepolepasur.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/30272057960.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/45502507416.pdf
    • https://cdn.shopify.com/s/files/1/0429/1769/1559/files/major_branches_of_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0434/2009/0535/files/lenek.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/49233377441.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/pojogoxosiwimilodeweno.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_off00005d6b.bin
e4ebc78e4f874f6fb2ccdab06d436001c10dd66052e5c2edca2381ab93d486e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6B 5492 bytes
font_01_sfnt_off00007042.bin
0cb2c88753bca9c77360798ec1f84355dd8d35d3c7430bb873a648f6f7f1616c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7042 14524 bytes

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