Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f5c3ac0f9ebe6c…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 06:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72df268db94a8e11bc4b269d4ad88ac9 SHA-1: 4869c497667f37fef95d180f4091d051c3a72aef SHA-256: c6f5c3ac0f9ebe6c9a2561de8863d1f44434f5d7ea8a828afabaf65d5b982412
120 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic firing indicating a malicious redirector. The primary embedded URL, https://ttraff.cc/wix?keyword=square+root+worksheet+pdf, is identified as a malicious redirector. The document body, though partially corrupted, contains text related to a "square root worksheet pdf" and the authoring application, suggesting a lure to disguise the malicious intent. The presence of a link farm further supports the malicious nature of the document.

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=square+root+worksheet+pdf
    • https://cdn.shopify.com/s/files/1/0432/7827/0619/files/27276583507.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/rojal.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/mazemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0942/5056/files/sigiluvi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2846/1206/files/cystotomy_in_dogs.pdf
    • https://cdn.shopify.com/s/files/1/0462/9073/1169/files/up_deled_2nd_semester_date_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1957/files/gemigepavusamosipetexejur.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/php_display_image.pdf
    • https://static.usrfiles.com/ugd/9ec29b_90aed5dc07114e84a237484acbb8955a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d11e7ab723e474db2ac34467a97e171.pdf
    • https://static.usrfiles.com/ugd/c8a981_359204147ea54efdb1d8720280fb16ba.pdf
    • https://static.usrfiles.com/ugd/f65518_afed85ad10124a5085c4cd170d476cdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2fbf2502bc746fe86a3c4dec6c5054f.pdf
    • https://static.usrfiles.com/ugd/b8c837_73dceebe9ee54879ac76d85f708e66c0.pdf
    • https://static.usrfiles.com/ugd/32777b_1df76f9135f14d00a2dfcaff6d8d3c9d.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_off00006075.bin
5c01b921f850ea94442eb4a573789f253e8094e6290ec6f77bcf1452dd5d9939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6075 5484 bytes
font_01_sfnt_off00007328.bin
0291ef66829fd9dbb3ddf9bb4204030a6ec153921413e87ceacda8a4576291fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7328 10380 bytes

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