Malicious PDF — malware analysis report

Static analysis result for SHA-256 3271cac73ecf1d31…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 11:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d64b5d5f846d425243acbc380f191e SHA-1: 2f85db140a9a6563896fecd4705862a3f4fdf054 SHA-256: 3271cac73ecf1d31ca451a1da43f8655d88c7abb59e7b20f4741f76e08520bb2
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains numerous embedded links. One of these links, `https://ttraff.com/wix?keyword=thesis+about+teaching+strategies+in+mathematics+pdf`, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain SEO-related keywords and the malicious URL, suggesting a lure to drive traffic to malicious sites.

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=thesis+about+teaching+strategies+in+mathematics+pdf
    • https://cdn.shopify.com/s/files/1/0449/3407/0440/files/namav.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/cistellaria_plauto.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/kamivisope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://static.usrfiles.com/ugd/b8c837_28a9738e42ed40d7a2144618ada34151.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/analisi_logica_esercizi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1473/1414/files/remesexefunuka.pdf
    • https://cdn.shopify.com/s/files/1/0434/0079/0170/files/26080157224.pdf
    • https://cdn.shopify.com/s/files/1/0459/7334/0320/files/noremurusigudavunajig.pdf
    • https://cdn.shopify.com/s/files/1/0440/8839/3893/files/45702004588.pdf
    • https://static.usrfiles.com/ugd/b8c837_f46c139bdfcd41d4b65fa8e75fc6a16c.pdf
    • https://static.usrfiles.com/ugd/7dd30d_db79e4b0fc8d4951ab0fe94d59fa19b9.pdf
    • https://static.usrfiles.com/ugd/576447_a9a444fd9ec54439aab3eccacd6d2a0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_34660902ac7545cfbb8a3f9c8db5ca92.pdf
    • https://static.usrfiles.com/ugd/b8c837_29692869cf324ca78c9d3388ca0ca43f.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_off0000688e.bin
f02e4e6e2fa36cbabfb4c76e8bd03f42145d5a756a4b314b83551c6faeed6d45
pdf-font-stream PDF embedded font (sfnt) at offset 0x688E 5624 bytes
font_01_sfnt_off00007b73.bin
b819ffdc250140aa6988b3e4701bfa1a42d2576edd3487cfe0ea78910b59d766
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B73 10580 bytes