Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1acbad731f72b0d…

MALICIOUS

PDF

43.4 KB Created: 2020-08-31 18:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f997f150d3b10aa9c149fc35af165285 SHA-1: 056055e8e8b1c0093c9c32084b4713792dc05d7f SHA-256: d1acbad731f72b0df33217d8bf7ae823b21d4b1fbbdb132e3c6432f6a398ab6b
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely 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.com/wix?keyword=meconium+aspiration+syndrome+pdf+2017
    • https://static.usrfiles.com/ugd/80c1db_7b3fe550959a4ea8ad09732b26cdc5a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdc282079e82424ca25f13a1dc5378d9.pdf
    • https://static.usrfiles.com/ugd/078c79_f2491af960f545a985eaa7be534ad800.pdf
    • https://static.usrfiles.com/ugd/1f5cef_0b38a469613b4ac89ab903b73ad35f74.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ac67685347c418a8d01357a5a585f4a.pdf
    • https://static.usrfiles.com/ugd/5926b4_08178ac2558f41a4a6cdda2e197a3c62.pdf
    • https://static.usrfiles.com/ugd/429b25_1cc922c9ad7f4c4983128a68bc82d811.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/59695057898.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/vevodotelawexosibeniduje.pdf
    • https://cdn.shopify.com/s/files/1/0433/6851/3695/files/asmedia_asm1083.pdf
    • https://cdn.shopify.com/s/files/1/0430/8048/2967/files/dukim.pdf
    • https://cdn.shopify.com/s/files/1/0437/8440/5153/files/vmware._vmem_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7711/files/bescherelle_conjugaison_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/rezesiti.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_off000065eb.bin
e2ddbda879be34da583d82feb03fe27213c3684e7ac61f324721802aba2ee902
pdf-font-stream PDF embedded font (sfnt) at offset 0x65EB 5780 bytes
font_01_sfnt_off000079a2.bin
b734f7e411c517874140a51c6e775a53fd3cd5960e94438b315bc30d6e1bbf72
pdf-font-stream PDF embedded font (sfnt) at offset 0x79A2 12472 bytes