Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da280f861e3009a…

MALICIOUS

PDF

35.7 KB Created: 2020-09-07 19:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25a5746fbba2ac9bdaa0d29a59093f86 SHA-1: 8274f8b6cf7e6cf723dd4cefc3a99538addf8d20 SHA-256: 4da280f861e3009a5913ec2d1a48059ec1db6617ddbe9e53fa71fa438a474742
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as sheet music, which redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector. The PDF also contains a large number of links to external PDFs, likely for SEO manipulation to improve the chances of the malicious link being discovered.

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.me/wix?keyword=darth+vader+theme+flute+sheet+music
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/autotune_vst_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/purofugijexumexobobo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1915/5109/files/calculus_1_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/3810/6023/files/wejusofafef.pdf
    • https://static.usrfiles.com/ugd/b8c837_6da0e753bd2a4a4aaa283a4db41a30f6.pdf
    • https://static.usrfiles.com/ugd/c1615c_c3a6d8a825ae4928815ddf0b77f7c163.pdf
    • https://static.usrfiles.com/ugd/eda9ba_dfff4f6fa3d848309230b61117359841.pdf
    • https://static.usrfiles.com/ugd/f967ac_364c472de45345aaa9bb4819b8847c29.pdf
    • https://static.usrfiles.com/ugd/ed64d2_b38883b01d6a4a019a3e9a4cf5ee4b7f.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/windows_10_education_iso.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/bleak_house_analysis.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_off00004daf.bin
051f653d7df9a6c425a1327bd51628bed1aa1c621b8528f626eb398e6c66548b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAF 5320 bytes
font_01_sfnt_off00005faf.bin
90ea3a5ed7fcf20052ae7f96bffb8c3125c27bbd6d2206fdf5a62aee0f1ef0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAF 10056 bytes

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