Malicious PDF — malware analysis report

Static analysis result for SHA-256 1555571c722f384c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-29 07:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57b9899fabb8313e8be73ebdea2c8a09 SHA-1: f0ddecf30e057521beafe382e4953536d2bb055f SHA-256: 1555571c722f384c518a72975763958a1e75e145fcac93c37771102034e3b1fe
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised as a download button. It also hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=is+it+bad+to+download+digital+games
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/7685/1614/files/reseso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5676/files/65243604443.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/94058229492.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/fisowubesowalomipoxonek.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/versace_target_market.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/wolitededizowuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8072/9251/files/37861489632.pdf
    • https://static.usrfiles.com/ugd/b8c837_283188c811c942d19e284eda39a8c6a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2df6c566e62b470cab6cedf5e051cdec.pdf
    • https://static.usrfiles.com/ugd/b8c837_4402322f5fa04236b3d0c8e7f7e9091b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3e8427112ef4690b94ea0ce4b491c6b.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d52.bin
2cbecc7dc69fa8a4e352ef709aa0f88a363e15b358c9e224caac4fcc7b8b9161
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D52 5220 bytes
font_01_sfnt_off00007f07.bin
f601ad364a3ac027c5d64f51cca55162d9c38fd8530478700dfd44072f9034f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F07 10044 bytes