Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a21cbf4fbcdb4b4…

MALICIOUS

PDF

98.4 KB Created: 2020-09-02 04:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89f95f1d56ba0cf0dc024f8045659d04 SHA-1: cdae3b20d2c353431b3fbceed84dcd53d18428c6 SHA-256: 0a21cbf4fbcdb4b4950d5405f09556f5ff82e2d95af83f0e35eca3094499a61d
154 Risk Score

Malware Insights

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

The PDF contains a link to `https://ttraff.com/wix?keyword=microsoft+excel+spreadsheet+meaning`, which is flagged as a malicious redirector. The document also contains a large number of external PDF links, many of which point to `static.usrfiles.com`, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly indicate a phishing or scam attempt.

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.com/wix?keyword=microsoft+excel+spreadsheet+meaning
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_932a3e4dac5f4f908cf08eeffd8b4eb4.pdf
    • https://static.usrfiles.com/ugd/01bc73_9d46bb7f097b4799b3f9c2f743d1d4a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e340b4e0341b4c08a2f918c0e687e228.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6cc0c3695a347a68395060aaec38f3e.pdf
    • https://static.usrfiles.com/ugd/314c35_0e5a5f689fbf4cdf9490d03185db9e91.pdf
    • https://static.usrfiles.com/ugd/628a76_5ec1b9a7a71448b38c5ee2e5054fe18a.pdf
    • https://static.usrfiles.com/ugd/b8c837_356230d3c3694ca8af539d8cba9a1ce1.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/solidworks_2015_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0471/0619/5606/files/15175051501.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/axis_bank_credit_card_statement_file_password.pdf
    • https://cdn.shopify.com/s/files/1/0439/1862/2875/files/30885107038.pdf
    • https://static.usrfiles.com/ugd/12f4eb_637c5090964f4ee5a024b7d08791b75f.pdf
    • https://static.usrfiles.com/ugd/e2b09b_ddaf55d5387d43b3ac1f9f2880283cf5.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_off0001389d.bin
2b275442eef949609c096729f22f5766970ad02680488841c6160f0b423f147c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1389D 5644 bytes
font_01_sfnt_off00014bb8.bin
fca3fc560436367cb370793c89de3173a51d877b5592ecc186b2676eedeec0a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB8 15380 bytes