Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ab387e97d0d6c5…

MALICIOUS

PDF

39.0 KB Created: 2020-08-01 04:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f4cac5a8a88322ab7eb83de41ba4b08 SHA-1: bd69af3c7cbfc29f7a24dbfe6c4220f6d1f56338 SHA-256: c7ab387e97d0d6c53d3d948e95b53c2d844c4054c36982dc7fe07f254685b823
120 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=cswa+practice+exam', suggesting a lure related to a 'cswa practice exam'. This redirector likely leads to a phishing page or a malware download. 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.cc/pify?keyword=cswa+practice+exam
    • http://files.dbhomeatlast.com/uploads/1/3/1/4/131452938/fibuz.pdf
    • http://files.astoriabehavior.com/uploads/1/3/0/7/130776208/9669493.pdf
    • http://files.schumacherbrothersfencing.com/uploads/1/3/0/7/130738732/247995c0f3e552.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.pdf
    • https://cdn.shopify.com/s/files/1/0429/0671/4268/files/deteramuraxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4909/files/52332629590.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/noraf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6550/6966/files/33146281722.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/numerical_analysis_2nd_edition_timothy_sauer.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/67911828636.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/waxaraw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/law_school_personal_statement_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/fenolamufawozower.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/jamamidivuwuminotaxupo.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_off00005a21.bin
a931fd178564ffbe120d861e474b78333f43e1fea610c4be43d74e7b7d3777c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 5112 bytes
font_01_sfnt_off00006b7d.bin
e3c596d88f8f59cca1dc44a1534cfbb22e91f55974292d9a38c5fdf8d11b2bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7D 10540 bytes

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