Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66d2b8c2049e21f…

MALICIOUS

PDF

44.8 KB Created: 2020-09-05 20:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 416d136c7cf67890f4e843534f10697e SHA-1: f7280d462fb5d549f01dcdbe373acee048f55c38 SHA-256: c66d2b8c2049e21f212c272d6488ae24daf6f6fdb743543ae9f4eb9bc0919a8a
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for a PDF redirector link pointing to ttraff.me. Additionally, another critical heuristic detected a large number of embedded external links, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text but includes the suspicious URL and several other URLs hosted on static.usrfiles.com, which are likely part of the link farm.

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.me/wix?keyword=php+date+format+get+full+month+name
    • https://static.usrfiles.com/ugd/b96e41_58b2eb19dfea4f159d5326a9db00df6b.pdf
    • https://static.usrfiles.com/ugd/4ca7f5_dfd61c9776e2423b834426b525b9393c.pdf
    • https://static.usrfiles.com/ugd/6f58fb_71870dd1fe334c6ebcecdd3c2758d4b7.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_33af41465a1244378ad242ba992d8769.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1272/files/bojamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/miduzamileporiluraxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8102/files/gimazuxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2531/6514/files/lomilasavedifom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1073/files/fobuvevoxe.pdf
    • https://static.usrfiles.com/ugd/b8c837_7939f6dd75bb4f98a9d5adffb1a465b1.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_9ff57e538b3a4c0cb79061b3a608b437.pdf
    • https://static.usrfiles.com/ugd/4479ed_387e8acea2284796aec94bc625b2c9aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_93879a5317f44462a68c02a82ce7a5da.pdf
    • https://cdn.shopify.com/s/files/1/0434/5017/1554/files/depiz.pdf
    • https://cdn.shopify.com/s/files/1/0463/0636/1504/files/gewufofirenuzopesujeligo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/authorization_form_for_background_check_first_advantage.pdf
    • https://cdn.shopify.com/s/files/1/0464/7177/4366/files/omers_pension_plan_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5495/files/affidavit_of_support_philippines_form.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/
    • https://cdn.shopify.com/s

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066da.bin
d54666396f24b37ff7b24fa7ffbd290d0df2c52faf46a62b9b5cd3eb1e50c4aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x66DA 5276 bytes
font_01_sfnt_off000078ab.bin
7d9dd33c8d90902fb7e098a09605c8019bfa6507e59d9ea621614a923cf44290
pdf-font-stream PDF embedded font (sfnt) at offset 0x78AB 14116 bytes