Malicious PDF — malware analysis report

Static analysis result for SHA-256 d883dde5cf7731dd…

MALICIOUS

PDF

49.5 KB Created: 2020-08-31 04:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0043aec603384eb90de8f92619c04729 SHA-1: 1e50057834c58b31c7cb5e283be3ab4ffc84fb0a SHA-256: d883dde5cf7731dd632b9ef6cab136488162e8aabcab9426939593b39803ba07
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the redirector. The presence of a large number of external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=concepto+de+balance+de+comprobacion+pdf
    • https://static.usrfiles.com/ugd/0dcf4b_0be898631ac4495585cb6b1fa1c16295.pdf
    • https://static.usrfiles.com/ugd/289c5e_349b3d5b925d4c0795f8da1b50908742.pdf
    • https://static.usrfiles.com/ugd/d3758e_3480df07627245f7a463d1dde447b49d.pdf
    • https://static.usrfiles.com/ugd/7c3584_1efa5a47888a450a8c5c99350f235ee2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3b3e9e6523146d191ab8bd65508d732.pdf
    • https://static.usrfiles.com/ugd/e8506d_9dee6b2874554f6193d6697a97e6a3a7.pdf
    • https://static.usrfiles.com/ugd/99965f_f5e19d1aeae24d458359150aee98ec22.pdf
    • https://static.usrfiles.com/ugd/07ef24_06ed29a1812445138e1d106e819576dd.pdf
    • https://static.usrfiles.com/ugd/bd5c68_511266a191254ce2ac55d05e79bf6f6d.pdf
    • https://static.usrfiles.com/ugd/b7306e_7a6f064ea4a8410a98c109e981f66530.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/call_of_duty_4_modern_warfare_torren.pdf
    • https://cdn.shopify.com/s/files/1/0462/6389/4173/files/skyrim_dragonborn_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2460/files/bored_in_adjective_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/8885/5718/files/upsc_prelims_2019_answer_key_ias_parliament.pdf
    • https://cdn.shopify.com/s/files/1/0432/0218/3325/files/7505363524.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/kibupilovuxekoru.pdf
    • https://cdn.shopify.com/s/files/1/0436/1001/3853/files/autodesk_vault_server_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/sociology_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/6929/2188/files/92612898111.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_off00006545.bin
33db12db644925f249342b016aee9c536dd895f80b8d263e2fb916328948a888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6545 5072 bytes
font_01_sfnt_off00007655.bin
80b6296769051f820270d1ec2e856f01177b80af8cfcdf01bd4212313bf0b54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7655 2264 bytes
font_02_sfnt_off000080ae.bin
eaae5490c0af36a2844490b0402d775c9ed6bcb52e6ad482c3ebd443493cd6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AE 12704 bytes
font_03_sfnt_off0000a873.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA873 4324 bytes

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