Malicious PDF — malware analysis report

Static analysis result for SHA-256 298835834d47de46…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 08:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f63a8c2a77e4f07c48b18eb1dbeec4 SHA-1: b25f555581f475ac80ea228cf951b31dcd343c49 SHA-256: 298835834d47de466beec4f60626116df9cb9baf7157e6c33b0600372062854c
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One prominent link, https://ttraff.cc/wix?keyword=bengali+comics+books+pdf+free+download, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into downloading content under the guise of free comics books. The ML classifier strongly flagged this PDF as malicious.

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.cc/wix?keyword=bengali+comics+books+pdf+free+download
    • https://static.usrfiles.com/ugd/b8c837_c046e6c9db3f4ae79f7e44e1e978235e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dbb8c5f67c64c6e89d56df9f1fa27d9.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_d394d81f6885495385fd10e3751bcfb8.pdf
    • https://static.usrfiles.com/ugd/de3d83_7fae6c6f42c64236abacc8075e6d605a.pdf
    • https://static.usrfiles.com/ugd/7041e4_8997d181614c4706895cedb9d16f61f2.pdf
    • https://static.usrfiles.com/ugd/6df952_8f358418c7da495eb2e8d57db497e656.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/aiou_b._ed_admission_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/wekapizolipukabupepe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4791/files/physiology_practical_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/74373423216.pdf
    • https://static.usrfiles.com/ugd/078c79_48e8a499ed504ce9a7a64957297afe4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb47b5f1d4014dbdb96ac6e2fda0fb45.pdf
    • https://static.usrfiles.com/ugd/b8c837_e92239d1f71f462a970f23ad998aaf7b.pdf
    • https://static.usrfiles.com/ugd/9cc572_049aad43f42f41788e61a7253e8a9737.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004502.bin
39a78914f6dde8fdbcd0ee5e856bdcdc9cf5fe62657c3f6b223a9189d4b5d3e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4502 5528 bytes
font_01_sfnt_off000057b1.bin
49ff93a7c8a15422889d9ef2bb001dfb047f10826eea701cdd4ee7cf0cedd569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B1 5636 bytes
font_02_sfnt_off00006a44.bin
cf9cb6eafe0f6e70535c7a7991d2bbc744df3fee4d907e07c5ca4f6473f8e158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A44 9668 bytes
font_03_sfnt_off00008a8d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8D 4324 bytes

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