Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dac771fd40252b…

MALICIOUS

PDF

42.8 KB Created: 2020-08-19 20:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dad127e26ed1f11066cae9c0b0aff452 SHA-1: b523035a23204930357a09e427d186ddf3342f3a SHA-256: 83dac771fd40252bf026aabe610a565eb1589dfe82d3505d5d9eb33febce15c5
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=cash+flow+management+techniques+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'cash flow management techniques pdf', suggesting a lure. The presence of numerous external PDF links, many hosted on cdn.shopify.com, indicates a link farm designed to improve SEO for malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly suggests the intent is to redirect the user to a malicious site.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=cash+flow+management+techniques+pdf
    • http://files.domaplasma.com/uploads/1/3/1/1/131164534/gifuwubumip.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2233/files/rekt_not_rekt.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/garipameb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/barmer_patrika_today_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6496/files/cepacaina_spray_bula.pdf
    • https://cdn.shopify.com/s/files/1/0436/3560/5664/files/49928494724.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/75720311280.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/61038869983.pdf
    • https://cdn.shopify.com/s/files/1/0436/3101/8142/files/xuzezikibexolasozurupu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7808/1955/files/84774827829.pdf
    • https://cdn.shopify.com/s/files/1/0439/0230/4408/files/pearson_algebra_2_common_core_teacher_s_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/62921796284.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/52114455075.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_off000067ea.bin
a4d8af84d4a3d8218fb77759d4d5411c2046a7557c02c777a2807dc85659170d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EA 5596 bytes
font_01_sfnt_off00007ae1.bin
6f88fa956eb1cd9aa92643a47dd7af0d29db02108d7e772f876a61439c313e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE1 10356 bytes

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