Malicious PDF — malware analysis report

Static analysis result for SHA-256 910df7c86c1bf5ff…

MALICIOUS

PDF

35.5 KB Created: 2020-08-11 22:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5130e2996a743b6f6f73a2d468907c42 SHA-1: f089419965e718f82fc02801bb6b5bfe1085b976 SHA-256: 910df7c86c1bf5ff76cdcae6dfb7ba4512ac8e826bff57fd417a73ca489d4dbf
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/wb?keyword=cutting%20edge%20pre%20intermediate%20student%20book%20third%20edition%20pdf. The document body also contains this URL, suggesting it is the primary lure.

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/wb?keyword=cutting%20edge%20pre%20intermediate%20student%20book%20third%20edition%20pdf
    • http://files.karaikudivoyage.us/uploads/1/3/1/4/131437276/00fd08a3.pdf
    • http://files.elizabethhitzel.com/uploads/1/3/0/9/130969485/kiropurukidob.pdf
    • http://fezujat.howwecomeapart.com/uploads/1/3/1/4/131438137/bolelarolagiz-dopoj-pezusus-tavoro.pdf
    • http://files.colosseumkennels.com/uploads/1/3/1/6/131636941/82d6d7927.pdf
    • http://files.labphotographylab.net/uploads/1/3/1/3/131382447/maganufigasoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7913659608.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3411/files/mesojisilu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/pemosumolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5571/8298/files/34759051856.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/22951111071.pdf
    • https://cdn.shopify.com/s/files/1/0430/9113/2567/files/bajinosajezazutosis.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/vamirogijizijogugekil.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/61849544637.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/18296755612.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/850196904.pdf
    • https://cdn.shopify.com/s/files/1/0430/1353/7951/files/86169219411.pdf
    • https://cdn.shopify.com/s/files/1/0437/0857/9993/files/conducting_polymers_review.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_off00004bec.bin
0bdb842c7a0fffc22e7620dc12741cc1ccfb58a83f28142eb84cfd24e553afca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BEC 5532 bytes
font_01_sfnt_off00005e81.bin
6fb27252fccae11de848c461f2b80133789bff82b79c75483ad2b1b2f5af3c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E81 9884 bytes

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