Malicious PDF — malware analysis report

Static analysis result for SHA-256 7baefcea968e0584…

MALICIOUS

PDF

33.4 KB Created: 2020-09-17 05:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1494d50ef7dbaaffbc3ad505d20b65a SHA-1: ab6a755c6e6eadd4618d9f007dea9f592161a2a8 SHA-256: 7baefcea968e0584067916e4fcd492cfabb7c6dca2356a562f5771d1feb29790
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high ML score and the presence of a link to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links to external PDF files, characteristic of a link farm or SEO poisoning tactic. The document body contains garbled text and what appears to be metadata, but the primary malicious indicators are the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.link/wix?keyword=iori+yagami+figure
    • http://gawun.opencoarrays.org/uploads/1/3/1/4/131453984/dukit_rexiwusonanuj.pdf
    • http://junamuz.icombatbournemouth.co.uk/uploads/1/3/2/6/132681237/puwiberaxegoduveb.pdf
    • http://files.strotherlab.ca/uploads/1/3/1/8/131857920/dufega.pdf
    • http://files.rachellelabellesbooks.com/uploads/1/3/0/7/130775518/wasuroni.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0294/files/waltz_of_the_flowers_piano.pdf
    • https://944c8b4d-9de5-42a3-bc90-6d263c31a168.filesusr.com/ugd/10b11f_f0f07314552e4fc6a54ba6a2d2afec5a.pdf?index=true
    • https://66e652aa-de13-48b2-b3aa-feffbf99067e.filesusr.com/ugd/9b7d8a_c591e2a67e724c69b8503dd1d9dc5ea7.pdf?index=true
    • https://49e995bb-f171-49f8-93f5-c307c096856c.filesusr.com/ugd/3bcfef_d5a4afe8d0a24835801841e1299329a9.pdf?index=true
    • https://1885e8a6-1070-4eae-b607-0fb440daf634.filesusr.com/ugd/3e5db3_7faafe329d2d49f691a4760ec2ef351f.pdf?index=true
    • https://4ac7eaf0-39da-40fd-ade4-0ec66af8eb49.filesusr.com/ugd/ea2c45_8828de4ff47b49b4b648214def6e4ca6.pdf?index=true
    • https://6f3e643d-1e13-48ee-b672-e6607aca2486.filesusr.com/ugd/96564c_1faf7a18d2644f1b90865e69c06c2c1d.pdf?index=true
    • https://0ead590b-7022-4fc2-a45f-ecf63ad91c1e.filesusr.com/ugd/1c8c1e_6efa66a1939f49f4b3143e16f8278094.pdf?index=true
    • https://0b0ec471-7a4a-4c9d-87ef-d06a5ec85047.filesusr.com/ugd/c068f8_4a41aaabf22944f7b7d1964393ac9b54.pdf?index=true
    • https://70bb0005-9abc-4262-9918-2f16b7141c1e.filesusr.com/ugd/0286dd_343e04438bbd4f14ad57a3b9ff93fdfe.pdf?index=true
    • https://e2715a3e-0639-4f32-a087-f9a896f91763.filesusr.com/ugd/b148e5_ab543b01c74e4d5cb09f9c177e917c9e.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_off00004ac7.bin
b0d80fbc5fce83bf3509bcc55153d07fc3ffaf1dc5d5b619cab7dd36d8554f3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC7 4916 bytes
font_01_sfnt_off00005b7a.bin
3d3065f74fa33b2ee09b21b99312ffe1bece8633435aed619136b2d9a17a4090
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7A 8736 bytes