Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7cc7f77d4f0a10…

MALICIOUS

PDF

42.3 KB Created: 2020-08-20 00:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a428604bd83ab98ed68f65c6a19794 SHA-1: 1d7358bbab4a5995b022c968bf910b853ea153c7 SHA-256: bd7cc7f77d4f0a101cb37119819a8b7de0f621131e5a050bf7fab6963cb2d4ad
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector to 'ttraff.com'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the distribution of malicious links within the document.

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/pify?keyword=understanding+irony+worksheet+answer+key
    • http://jazitume.mmflackdesigns.com/uploads/1/3/0/7/130776680/miwalerufexunun.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/softplan_architectural_design_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/fogama.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/genilosojosadixixaze.pdf
    • https://cdn.shopify.com/s/files/1/0449/0277/6999/files/xavobazawurolezalisatodor.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/61589746805.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/petsafe_wireless_collar_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/41243779322.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80084587067.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/xitowedalavolusuro.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/67519898575.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7261/files/plagiarism_scan_report_small_tools.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/susenesa.pdf
    • http://www.readwritethink.org/classroom-resources/lesson-plans/understanding-irony-31142.html
    • 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_off00006757.bin
f1fc79e6af7090ac78604a0c619861f04c14ffbb6c9880e3d8e547cd97e9a389
pdf-font-stream PDF embedded font (sfnt) at offset 0x6757 5304 bytes
font_01_sfnt_off0000796c.bin
e567f4b9a386c08b6d84a4fedaeee5ac4a84823248b4afdd2a21a6586fff0409
pdf-font-stream PDF embedded font (sfnt) at offset 0x796C 10192 bytes