Malicious PDF — malware analysis report

Static analysis result for SHA-256 440d8867040e608c…

MALICIOUS

PDF

56.9 KB Created: 2020-08-30 03:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ee774dae25445b002b85b74f938f17 SHA-1: ba172940a00de193e82a668daf75221b13ddfcad SHA-256: 440d8867040e608c66f67c06b55151f7842a289518dca596c0783c60780a6896
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL. The ML classifier strongly indicates maliciousness, and the PDF structure includes a link farm, suggesting a phishing or redirection 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=workstation+domain+risks+threats+and+vulnerabilities
    • https://static.usrfiles.com/ugd/b8c837_e51e4b763c4d4ca480252d4b11fa2a4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_44121cb3184d4762b3b64512f465a8bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_e98a78be759f4755a6cfcf6a87a56ff2.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbaaeef765e44aec8c019e6d1b63adac.pdf
    • https://static.usrfiles.com/ugd/067ecb_c2f911c2166c43bc8161f5a7dd4e7fc9.pdf
    • https://static.usrfiles.com/ugd/625844_454bf44dc9254f269f903757c52da959.pdf
    • https://static.usrfiles.com/ugd/74a852_e8c0a631c04948d5a6e2627a4f5847e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_66ffbac10baa43a1afe90f3009dc55b7.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/gcse_english_language_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0573/8149/files/begukap.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/32330196754.pdf
    • https://cdn.shopify.com/s/files/1/0429/3545/1804/files/virosomeronu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/91193749662.pdf
    • https://static.usrfiles.com/ugd/b8c837_c112fd4767cd431aad59b708858221f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f989ae8e67454aa888573520db37d1a6.pdf
    • https://static.usrfiles.com/ugd/2c8d66_bf178efe8a084788a6736b57b503cee4.pdf
    • https://static.usrfiles.com/ugd/b85eb0_bdf08a65efbe4f909dd804265e5c2dac.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c131cd4cbad45bc85f6eeee93fa6c88.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_off0000a000.bin
87ed967dd9e91627a8cab6784b39d8d0f28fc183eda836d973714e1d88903909
pdf-font-stream PDF embedded font (sfnt) at offset 0xA000 5344 bytes
font_01_sfnt_off0000b20b.bin
1b5511b68df719833f82c81b3c2a5ac481be680f1a762d230f0fc0da336d0e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 10532 bytes