Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b85bdb2c8b4a71…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 15:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c8f488d3be734a43bb4d077bde2a88 SHA-1: f22b038c90e3613d4886eec55e13621977614b64 SHA-256: 09b85bdb2c8b4a716fafcbbc216413003ec5c7657cb279c6e7c2334a99ff3607
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign content, but one prominent link, 'https://ttraff.ru/pify?keyword=grade+4+elapsed+time+word+problems+worksheets', is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, potentially for further exploitation or phishing. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=grade+4+elapsed+time+word+problems+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/de3d83_9da2fead8c944d5983fcbaca92844137.pdf
    • https://static.usrfiles.com/ugd/81d6a4_ec2f5da7b8234082a46c77edec952dd7.pdf
    • https://static.usrfiles.com/ugd/a474dd_be27f89f981440dab616aa938d203a35.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/61917398662.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/vejekanoradetuxuwa.pdf
    • https://static.usrfiles.com/ugd/b8c837_abe97db8667f451eb4f9fc76bc0e7710.pdf
    • https://static.usrfiles.com/ugd/097bd5_48d2bba2e20643d2a432e717798a1df0.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/blouse_cutting_and_stitching_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/36407889344.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_off00006583.bin
296281adb58a3b299a9514e21af40f130eed7b7678cd88c02eeac30e8d7cf2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6583 5616 bytes
font_01_sfnt_off00007881.bin
85a1f045bc26281ca522317dc9ddde14dcd64f8cb0eb8a77d26caa04b79deda4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7881 10192 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.