Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c35b555e4da18b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-29 22:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ff56e3b7ec3aa07c436dcfb2db39337 SHA-1: 2848638b025ce6b8c1cbbec6e6b4f444ac40779e SHA-256: c5c35b555e4da18b448ec3f110d3426d1542feba223b0057aab96a711ea7aa54
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=adj+order+exercises+pdf'. Additionally, it exhibits a PDF link farm behavior, embedding numerous external PDF links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same redirector URL. This suggests the primary goal is to redirect the user to malicious content, likely for phishing or a scam.

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=adj+order+exercises+pdf
    • https://static.usrfiles.com/ugd/b8c837_0477fee2ee2e4f7086ad927eaeb3ddf1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0e989ece0c043408877d2cb320f75f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0eb3a93c1f1a424090ce6f63b8e968f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_1379859d0ae04611b2704b36c748368c.pdf
    • https://static.usrfiles.com/ugd/238140_8a5cbe086c81429ba00f1abe9a117065.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/fatotifudobobanofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/complicaciones_de_meningitis_bacteriana_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/timupusakotiwofurotibidas.pdf
    • https://cdn.shopify.com/s/files/1/0435/5493/0839/files/87582329504.pdf
    • https://cdn.shopify.com/s/files/1/0432/0837/6482/files/safukisokijizapidusuf.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b1b6fdcb2ee450ab16f69ee811afecf.pdf
    • https://static.usrfiles.com/ugd/b8c837_4efc041662804cd8850484ddba4488ab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/holy_bologna_wow_classic.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1207/files/fierce_conversations_meeting_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/bapozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/bleacher_report_nfl_picks_week_4_2019.pdf
    • https://cdn.shopify.com/s/files/1/0439/1567/3752/files/anisocytosis_and_poikilocytosis.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_off00005d41.bin
1484dc34a715f5529189373ff1afc32aa820b7eafbd6b8b4d303b72d4ad685f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D41 5040 bytes
font_01_sfnt_off00006e88.bin
71ba76d8b5fcec2df01ae36c98d0b4bcf20950282493bb897eb84acd44363d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E88 10328 bytes