Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbeb479799e51e8c…

MALICIOUS

PDF

35.2 KB Created: 2020-08-31 04:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b423b74e9404dee764912af844273b SHA-1: 096a28b6110dfc91b24f704bc1b937728402de98 SHA-256: cbeb479799e51e8cd462d366e784d42012bdf7b86c35fd7f5f5e7d6783c49b23
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to '50s piano sheet music books' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=50s+piano+sheet+music+books
    • https://static.usrfiles.com/ugd/a2d007_958817ef2221472c99fe6827383abf31.pdf
    • https://static.usrfiles.com/ugd/a2e20a_c11a55a9af3e45478814b50752572b50.pdf
    • https://static.usrfiles.com/ugd/c12414_67cb31fe06dc485ab5eb3556dce231cf.pdf
    • https://static.usrfiles.com/ugd/89c6ad_32be7260cf344577ae9815b8f8f8fbbd.pdf
    • https://cdn.shopify.com/s/files/1/0429/0904/0803/files/betudubuvetogerox.pdf
    • https://static.usrfiles.com/ugd/32777b_014dd53eb95243edbd7ecd75f8d5b3a0.pdf
    • https://static.usrfiles.com/ugd/158fb9_2bf8b2deaa25457e95a36e9be6cf448f.pdf
    • https://static.usrfiles.com/ugd/b8c837_84efde7250314dec8f068c642ff89482.pdf
    • https://static.usrfiles.com/ugd/afe78f_3925f0af06b64895b7eece9407fa758b.pdf
    • https://static.usrfiles.com/ugd/913720_af8a6cf289c54a6b8eedc2a16f17ee26.pdf
    • https://static.usrfiles.com/ugd/1a89c8_a687702096a64e1098012f0d53c6ca4f.pdf
    • https://static.usrfiles.com/ugd/585b1d_421edd177fad4d56badcd34a7b52bfba.pdf
    • https://static.usrfiles.com/ugd/111c46_23d7e660b51844a1823888a187da7669.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_off00004a60.bin
e54b34574b9d484c1f4db469ea6aa0fef78db6e76a9e5127c35efc8eccbf876d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A60 5420 bytes
font_01_sfnt_off00005c98.bin
7925058006bfbeadfd47214c16b5cd8bb460ea03715977d9f751b94385ad49aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C98 10052 bytes

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