Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4789927c7c9c1e…

MALICIOUS

PDF

43.7 KB Created: 2020-09-20 18:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 959ae104ced4fb457e5ec69289819925 SHA-1: c2c5398418b240831bf91b26ce45010239efa555 SHA-256: db4789927c7c9c1e7886c34cc9f72e7edc12a6ceec847dafd86a0b911c73c0b1
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. One prominent link, 'https://ttraff.me/wix?keyword=reciprocal+graphs+worksheet', is identified as a malicious redirector. Another heuristic indicates a large number of PDF links, suggesting a link farm, with 'https://cdn.shopify.com/s/files/1/0431/2953/6668/files/the_phantom_portal_prizes.pdf' being the first identified. The document body, though heavily obfuscated, contains text related to 'reciprocal graphs worksheet', aligning with the lure presented by the malicious link.

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=reciprocal+graphs+worksheet
    • https://cdn.shopify.com/s/files/1/0431/2953/6668/files/the_phantom_portal_prizes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/sotijarutedepapasuju.pdf
    • https://cdn.shopify.com/s/files/1/0439/2452/1128/files/92677465605.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/tidazinunibakinaj.pdf
    • https://cdn.shopify.com/s/files/1/0457/5907/0372/files/pijojapedajiraxumomukas.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/99423897870.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/9720953863.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/anti_hijacking_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0463/0852/4194/files/52512553732.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/32318143616.pdf
    • https://cdn.shopify.com/s/files/1/0431/0699/2289/files/stay_alive_full_movie_123.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/free_kindergarten_shape_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4206/files/bissell_proheat_carpet_cleaner_parts.pdf
    • https://cdn.shopify.com/s/files/1/0438/9643/8936/files/format_factory_software_for_pc_free.pdf
    • https://ae21e065-15f9-45a4-b46f-070803797af7.filesusr.com/ugd/1e4819_1adde9d637764e6fa2be1325927447a8.pdf?index=true
    • https://cf1342c5-f52a-4a02-b6bc-0e51db2388d4.filesusr.com/ugd/1849a1_e1eb357ebbb1498787176b52d7b22cad.pdf?index=true
    • https://1c0c9d6e-bc64-4b20-aea2-0190109e10cc.filesusr.com/ugd/45fd81_b028bdbc95bf40368778f7e4ec4d2166.pdf?index=true
    • 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_off00006b90.bin
1eae1ed0b67a90275a9ddab50f609fb0646d8b6b7bc64ae0bd7a4a372538a577
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B90 5360 bytes
font_01_sfnt_off00007dda.bin
d392455da4462d1e0cb0f2b7d0ac4cecc6da761ad540f1b1f8ec4b09f7643a68
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDA 10524 bytes