Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dcd881a6308658…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 12:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e3faad8839c6840de329a6ddf171f31 SHA-1: a941e111ff29674a829b114ae8906375eea89996 SHA-256: c8dcd881a6308658bdc6f170e0d3e5d42a0bd04b397f7049c6ebecc71b3578a6
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links, https://ttraff.ru/wix?keyword=casio+gwm5610-1+india, is identified as a malicious redirector. This suggests the document's purpose is to direct users to potentially harmful content through a chain of redirects and linked documents.

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=casio+gwm5610-1+india
    • https://static.usrfiles.com/ugd/b8c837_48127191b83d43da81e17ede95c023b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdc032211353441aaf2642c7d3f9f21f.pdf
    • https://static.usrfiles.com/ugd/99a8f2_ef6a81df577a46ba836a7832fc10c634.pdf
    • https://cdn.shopify.com/s/files/1/0432/2603/8433/files/9561663565.pdf
    • https://cdn.shopify.com/s/files/1/0428/6159/2742/files/ukulele_songs_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/7408/3233/files/dead_cells_guide_boss.pdf
    • https://cdn.shopify.com/s/files/1/0449/7106/5503/files/azatioprina_y_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/9670518714.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/80364244884.pdf
    • https://cdn.shopify.com/s/files/1/0440/8174/1976/files/40062199361.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/goxaxitamimi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1854/2504/files/71766767984.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d4ba40b1a6b4112bf25479cba565d0e.pdf
    • https://static.usrfiles.com/ugd/cc089a_e3f9cd40f0ab48d79e0e07f56fd18236.pdf
    • https://static.usrfiles.com/ugd/b65acf_b8258a3d8e64468e8d03e41aff750e15.pdf
    • https://static.usrfiles.com/ugd/ca300b_9d8ecdb8d1e8426fb959e280c6dcb536.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e7d491488694388b49b5e72010ebf10.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_off00005d14.bin
4b2da753d36a766463a94a3baeee344f3ef1d3def6d85523987b54b1a801d5ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D14 5520 bytes
font_01_sfnt_off00006fea.bin
ed28d209f1565596697ef70ebdd4b6d3b24ca804b7a43134ff6e3f92ccb19964
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEA 10320 bytes