Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78ea0ab86142383…

MALICIOUS

PDF

54.9 KB Created: 2020-08-29 20:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f235910cd8b7dcd80009344f8e5327ca SHA-1: 7f53a5d29299ad98491eb62c897c7b612df4aa7c SHA-256: e78ea0ab8614238312dc5991f62cb89cda8ca11dea1f1e78865eb5d6bef51322
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.cc/wix?keyword=oraciones+catolicas+basicas`. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=oraciones+catolicas+basicas
    • https://static.usrfiles.com/ugd/b8c837_32d3486222454cd68abd59b2f62f3870.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2190803f6a4aa79018dbb087649e63.pdf
    • https://static.usrfiles.com/ugd/b8c837_99c392296dbf4d24ac4d164e98b1cf7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fb0485d9fc746c787d23e5200cb245e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfed0368144b4d54898b2bde364a1518.pdf
    • https://cdn.shopify.com/s/files/1/0466/6959/4789/files/dolby_atmos_android_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0438/2015/5042/files/anthropometrics_and_ergonomics_in_interior_design.pdf
    • https://cdn.shopify.com/s/files/1/0449/7742/2494/files/zygmunt_bauman_libros_amor_liquido.pdf
    • https://cdn.shopify.com/s/files/1/0432/4468/3432/files/gobafokuboriwaje.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9703/files/najilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9144/3364/files/servidor_dhcp_linux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sibubemazalomasedexikeme.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/chemistry_notes_for_class_12_cbse_solid_state.pdf
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/bsc_3rd_year_chemistry_practical_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/pathfinder_advanced_race.pdf
    • https://cdn.shopify.com/s/files/1/0435/9333/4947/files/17424737697.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_off0000752e.bin
be3eae72e121a8b540c09684679235256b52c0f299318c5f7153498821eb9529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752E 4748 bytes
font_01_sfnt_off00008548.bin
b8f91614ad77f0762f6cdfabf4d0bf4be90568acf05728f5405722ffe4ab8bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8548 11548 bytes
font_02_sfnt_off0000aa14.bin
7fd215d972d404958043ebd4d16fdbb1e7ab2dc7dff5962b7fa945e51cac7b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA14 16076 bytes
font_03_sfnt_off0000bebe.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBE 4324 bytes

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