Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb633ecbdcf40b16…

MALICIOUS

PDF

38.9 KB Created: 2020-09-11 09:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b155928d7e07ee9243fd54bec6020ede SHA-1: f9f6e887c8725d98bd8e6c82bcf1164a6cf42308 SHA-256: fb633ecbdcf40b16d63d3bd03e5e9b4679313e7f0de3bb7e74d1870c6dbbeb56
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One such link, 'https://ttraff.link/wix?keyword=fourth+grade+common+core+ela+worksheets', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The presence of a malicious redirector link and the mass linking behavior strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/wix?keyword=fourth+grade+common+core+ela+worksheets
    • https://static.usrfiles.com/ugd/82d61e_ee9d2149623e4905bc05c947878e6806.pdf
    • https://static.usrfiles.com/ugd/38955b_7b739f4e565d455ebaa3f22736e81efd.pdf
    • https://static.usrfiles.com/ugd/3649d2_ec0211c1599a4dd5ab9c629ce634dc6b.pdf
    • https://static.usrfiles.com/ugd/3fd21f_5ae38efcaf3f41429d7ec11a73af4f80.pdf
    • https://cdn.shopify.com/s/files/1/0468/1390/5050/files/german_top_100_album_charts.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/2017469578.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5082/files/tepodaleporofub.pdf
    • https://cdn.shopify.com/s/files/1/0459/9663/8375/files/fake_doctors_note_template_word_document.pdf
    • https://cdn.shopify.com/s/files/1/0428/8829/8659/files/67793478097.pdf
    • https://cdn.shopify.com/s/files/1/0462/7175/8485/files/bootcamp_windows_7_drivers_32_bit.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_off00005983.bin
fba1e01cf134c7ad826688f7fe755d01aa2f998aa780331f01b97613336868d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5983 5464 bytes
font_01_sfnt_off00006c06.bin
a189d17d35c9c151405cbb378e72fc80d8d60d34898e5c9002ff5f460f296e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C06 10256 bytes

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