Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c9c9dc3a410689…

MALICIOUS

PDF

38.1 KB Created: 2020-08-31 07:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87b6af856cd9c0b3b41c42f460c1ae3a SHA-1: 7b461fc519af8d8da59aafee77c971dfe4482cd7 SHA-256: 98c9c9dc3a41068963f7b3f4d8f6bebdd5d4d3745245264086b85df9857114d3
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.ru/wix?keyword=zotac+geforce+gtx+1060+mini, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to the graphics card and the URL, suggesting a lure to a malicious site disguised as a search result.

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.ru/wix?keyword=zotac+geforce+gtx+1060+mini
    • https://static.usrfiles.com/ugd/b8c837_c951c817625f4eaab032288f870db976.pdf
    • https://static.usrfiles.com/ugd/1f2646_0617b986931541bda48280e3630798a9.pdf
    • https://static.usrfiles.com/ugd/ee4a13_08aab44d54294dcb9bbec4c6d1fc84f3.pdf
    • https://static.usrfiles.com/ugd/4c1554_e876868a3a9f4311afccba4db9722875.pdf
    • https://static.usrfiles.com/ugd/f96b02_da2b8f7de76b4b4ebf97336a8a44e2ae.pdf
    • https://cdn.shopify.com/s/files/1/0461/4268/5337/files/akuntansi_keuangan_menengah_1_kieso.pdf
    • https://cdn.shopify.com/s/files/1/0431/4749/3536/files/33274290798.pdf
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/87345968526.pdf
    • https://static.usrfiles.com/ugd/b4609a_c3af7d020bf94de1a9eb7cb5510fc5dd.pdf
    • https://static.usrfiles.com/ugd/0c268c_48d25beb03e441fabf852f63096f519b.pdf
    • https://static.usrfiles.com/ugd/16a96a_7f94f3b1fd0644839bb5f5b839439670.pdf
    • https://static.usrfiles.com/ugd/a86d68_403eb329bb594c24847b6653167d991b.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_d10ac3fb4b654df3b35f33e3cc862171.pdf
    • https://static.usrfiles.com/ugd/db93e9_8730bec648764118a61ad445221aa9bb.pdf
    • https://static.usrfiles.com/ugd/7c3584_b9fe69b8413e4c62a26a3225f3c1f131.pdf
    • https://static.usrfiles.com/ugd/2f07a1_a170b6595a634e47aafc34736b4c1a4a.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_off0000507b.bin
537a419c77ee9d19eef648aa1db79e063ac2e6b19c41d4d133e6ff75e9312191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x507B 5364 bytes
font_01_sfnt_off000062b8.bin
38bd032ca1e130467eae67fe9e6de973928c2bc108da6ea71454566fa6552ea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B8 12056 bytes

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