Malicious PDF — malware analysis report

Static analysis result for SHA-256 857b7c1863cd34ff…

MALICIOUS

PDF

37.3 KB Created: 2020-08-05 10:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76c09f4258a97316fc7d13cd59ab1493 SHA-1: ee11add3adb625e46916dd8905bc95d90f36e569 SHA-256: 857b7c1863cd34ff055a73fe9b892b952faf1d2a52a8132e6e471a5f2795d0b4
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking title, indicating a lure to trick users into clicking the malicious link.

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=rational+and+irrational+numbers+pdf+download
    • http://files.raquelmeraki.com/uploads/1/3/2/7/132740860/3354846.pdf
    • http://tebij.fxtitans.com/uploads/1/3/2/7/132712615/3374243.pdf
    • http://files.holisticaimtherapy.com/uploads/1/3/0/7/130776447/remuji-budenarefovug.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/bavikojivekunebilereron.pdf
    • https://cdn.shopify.com/s/files/1/0433/5665/1669/files/kovesedixopevumunema.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/dujobijud.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/xigegiwasisutifotitalutem.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/calendario_agricola_2020_peru.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/17892572232.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0957/files/gexabixalewumebep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/.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_off00005278.bin
a57392ce977cc3c617c3f91b9670ee26230bbcbe0ad9eb3ffbf99d50c1545e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5278 5428 bytes
font_01_sfnt_off000064e4.bin
3ff9fe0466957d89274663b3a9a780c8742bf3e1e72fffcd72de20e23a0f9b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E4 10296 bytes

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