Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1de7afde205079f…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 05:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb470bcdb09f32dab4ce14e20d363fd7 SHA-1: de0b715f75dd2cb07d4f7213b8152dabdf39ed2c SHA-256: b1de7afde205079fe53c84143c5844c0a2d4dcbca4693e94398ffaefce12cece
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a common technique for creating link farms. One of these links, https://ttraff.ru/wix?keyword=nogex+argentina+aerol%25C3%25ADneas, points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same malicious URL and several Shopify URLs, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=nogex+argentina+aerol%25C3%25ADneas
    • https://cdn.shopify.com/s/files/1/0429/0969/6156/files/area_of_combined_rectangles_worksheet_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/6951/3632/files/tomojojorum.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7162/files/how_to_clear_entities_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/bosniak_clasificacion.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2813e3612024092b46563c5f60a23ff.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_450e8edab4f248e3b93c03538461acff.pdf
    • https://static.usrfiles.com/ugd/b8c837_af2cee9a670f4813b69f73cfc40e8136.pdf
    • https://static.usrfiles.com/ugd/8ab72e_2179e1bcacf54ad9b947d8032e5f41a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9b01d07d95c4b9e85287a58ed98cc9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a80824a325b64bb391327b8d01d02783.pdf
    • https://static.usrfiles.com/ugd/432b07_0549179d243645eab913b6aae72d3d5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c00d0d0797c4653b174009bcae3e607.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e0d82353fcf42f18595ed52e8a2d523.pdf
    • https://static.usrfiles.com/ugd/a2d007_53e565f8b2964d6b94e04d4b8765b83a.pdf
    • https://static.usrfiles.com/ugd/912de2_2ea04551273c408b900668a3bd899fd4.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_off000058d3.bin
c4daf98e123c53c85848d98f17eb4b6f4752df0e2b86a0ae0cbe87f214d72e28
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D3 4944 bytes
font_01_sfnt_off000069c0.bin
c0b2a3c3264cd306f63840b13cfc511cc0d991d12a9b3a8f3425fc7dc9fcf42c
pdf-font-stream PDF embedded font (sfnt) at offset 0x69C0 11880 bytes