Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7487bc1ae275685…

MALICIOUS

PDF

42.4 KB Created: 2020-08-31 04:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4caa6db73de2fc138f6d6317fe554f3b SHA-1: 65651668264a81c43dc2d02648945a2e8e9adfcc SHA-256: e7487bc1ae27568565881d4cd2ae51cfd313543edd68f8a0f3a3fa1743af4114
120 Risk Score

Malware Insights

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

The PDF file contains a lure for a vocabulary quiz, which is a common social engineering tactic to entice users to click on embedded links. The primary link, 'https://ttraff.cc/wix?keyword=the+great+gatsby+vocabulary+quiz', is identified as a malicious redirector. The document also hosts a large number of other PDF links, suggesting a link farm or SEO poisoning attempt. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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/wix?keyword=the+great+gatsby+vocabulary+quiz
    • https://static.usrfiles.com/ugd/b8c837_2a7ab4fa13ef4a3381c92a1aa9ddd512.pdf
    • https://static.usrfiles.com/ugd/b444d4_039734cf9a87477c9418cbccbb95745b.pdf
    • https://static.usrfiles.com/ugd/735424_8106431f2541449ca80802a55ed019d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf709f4c772486cbde61e62e75b0001.pdf
    • https://static.usrfiles.com/ugd/6846fe_597f7a4d3f644e74acb6a4967ce08347.pdf
    • https://static.usrfiles.com/ugd/67e251_79dc6f26879d496194b4d50cb0dc86d8.pdf
    • https://static.usrfiles.com/ugd/529dbf_a3d2d64891914bc997606c4b70fb9fc2.pdf
    • https://static.usrfiles.com/ugd/2b3f46_7f994520d84248d1abe2f7f681d4d6ed.pdf
    • https://static.usrfiles.com/ugd/a107db_b01338dcf4cf4d058c1edea3709b58f6.pdf
    • https://static.usrfiles.com/ugd/912de2_3b9022faa6be41e4853bf05b174f25d2.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/niwonixojifididipugup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/zuzemopinuvagulifunulozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/7835538692.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/40459686421.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/jinuxaxasokibep.pdf
    • https://cdn.shopify.com/s/files/1/0438/9198/2491/files/tata_naskah_akreditasi_puskesmas_2020.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_off00006858.bin
9e527bb59560ac0864b0e74396ae08553ca83a85be3e38fed59055c849e5742f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6858 5488 bytes
font_01_sfnt_off00007b0f.bin
a5cd20862c59cd0adaf61ab28df2a4805015087fb16e2505b9128fcc831f0ca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0F 9824 bytes