Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc11f8e0d606f827…

MALICIOUS

PDF

35.6 KB Created: 2020-08-30 04:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d44361ec2515e1c2de8921b3bb008194 SHA-1: 863a3280bfefd6ad980a0520421c5ba734a31085 SHA-256: bc11f8e0d606f827ce93e43ae4b83b8869d7fef92e0af73eade9b9bfb0e101b9
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/wix?keyword=the+secret+destiny+of+america+pdf. The document body, though heavily obfuscated, contains references to this URL and other PDF files, suggesting a link farm or SEO poisoning tactic to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=the+secret+destiny+of+america+pdf
    • https://static.usrfiles.com/ugd/430cb2_0c26c13d1f2e43a5b6325c7c8f099008.pdf
    • https://static.usrfiles.com/ugd/510a18_00f867bb69314d5abdd1ec668a1d0de0.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_93a94381aa784ab5b6ee771a1c8afac2.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/demege.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/6997/files/73982640588.pdf
    • https://static.usrfiles.com/ugd/e643da_c4678bcb93454706955fa09d17934fe2.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2ee6f8678d1489fbb101be2827087c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3dcc434ccf4713bb7ef50dd056a26e.pdf
    • https://static.usrfiles.com/ugd/73c254_47005fd031744744ad25bcf9be0f1e33.pdf
    • https://static.usrfiles.com/ugd/b8c837_b97a0e3b72dc47ab8d3b8cce4610559d.pdf
    • https://cdn.shopify.com/s/files/1/0437/3469/6097/files/cambridge_igcse_business_studies_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0057/files/konadazazi.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_off00004eab.bin
9b1c7fac52f882071cee952fb722839eef8e555db18188f6bf84a8c78cacf0a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EAB 5416 bytes
font_01_sfnt_off000060f1.bin
6f321ec433f5fa3567b01e1c04e71cbadcc2b0d073c5a21695983c989461acce
pdf-font-stream PDF embedded font (sfnt) at offset 0x60F1 9684 bytes