Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe378c55e93f7a3…

MALICIOUS

PDF

40.2 KB Created: 2020-08-11 12:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 780b9c41b9c03a1fb0593cce4009b488 SHA-1: 7239a5ea41677f6320b6df11c86744e3f88e5b67 SHA-256: 8fe378c55e93f7a354fc9d52e6e17ad90aa68d657ef5c6896ca3d3aac23f99eb
120 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm hosted on Shopify. One critical heuristic firing indicates a direct link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same redirector URL and a seemingly benign PDF filename, suggesting a lure to disguise the malicious redirection.

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/pify?keyword=fur+elise+piano+score+pdf
    • http://files.accruemineralsinc.com/uploads/1/3/2/8/132814119/5875004.pdf
    • http://files.english4business.cz/uploads/1/3/1/8/131857527/2b3c6795ebb655.pdf
    • http://files.visceral-entertainment.com/uploads/1/3/0/7/130775949/nanen.pdf
    • http://files.eastcoastpearls.com/uploads/1/3/0/7/130739715/128063.pdf
    • http://files.jennadmassage.com/uploads/1/3/1/4/131437666/80a21dc0.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/19539037793.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pekuxiwitijumowiviw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/78208562001.pdf
    • https://cdn.shopify.com/s/files/1/0432/7292/9435/files/tidixikudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74731072541.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/jamojujowedumekezekupis.pdf
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/28927579168.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/11726896786.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/kafekugiberagu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/73615716070.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a4a.bin
2d7cab8c589a664d77c8c26872a1bcf38bf1a1153dfc0c5ad2b9bc2ccf5e6fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A4A 5104 bytes
font_01_sfnt_off00005bb4.bin
c1395731bcbb948161e3dbd2d574442bbfbbf0e2e7b61655a2925b18042f1aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB4 10224 bytes
font_02_sfnt_off00007ef7.bin
84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF7 16100 bytes

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