Malicious PDF — malware analysis report

Static analysis result for SHA-256 66173f0024994089…

MALICIOUS

PDF

39.7 KB Created: 2020-09-01 19:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8453b11dee9c83cb8728f1ccb07236fd SHA-1: 85f5562a57b6157ddef1dd8c97f5ae0678a28c58 SHA-256: 66173f0024994089ff44478a9c7359d916feda9edefff433c8724fb845d90f9e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating it's a link farm. One of these URLs, 'https://ttraff.cc/wix?keyword=andhra+pradesh+history+notes+pdf', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a coordinated effort to distribute content through these links, potentially for malicious purposes.

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.cc/wix?keyword=andhra+pradesh+history+notes+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5027/7783/files/access_bars_32_points.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/tironujaxatini.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3888/files/32597354751.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxasukazojolivuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/9884/0995/files/alektos_20mg_bula.pdf
    • https://cdn.shopify.com/s/files/1/0462/2139/4073/files/7_sins_indir_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/baaghi_bhojpuri_video_song.pdf
    • https://static.usrfiles.com/ugd/2b3f46_03c84978b0044bdf839a76dff680cd2c.pdf
    • https://static.usrfiles.com/ugd/9219f8_e2b96af3569a4e619c86c8c8aacac638.pdf
    • https://static.usrfiles.com/ugd/0dd040_f13e158a6c5748448481ad7a80c6d72b.pdf
    • https://static.usrfiles.com/ugd/286fb8_a663a295704a483cb059665f640bf36f.pdf
    • https://static.usrfiles.com/ugd/c1108c_ead9ad4b73944232858ce1aa6cdc43e6.pdf
    • https://static.usrfiles.com/ugd/55cc32_15ae1b19f27e425f908ee441ae396643.pdf
    • https://static.usrfiles.com/ugd/40512e_a2ed088ef2074f6282b2dbb8f926df5c.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e71.bin
983afa96f45302980d74dd5a5ae8b81cc29fd9c3ac36aa3e78a08f519da9a561
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E71 5188 bytes
font_01_sfnt_off00007016.bin
7feeb366741ad8be9e5fb59aa892ece00a3e5e295d46132bf0bdc9935e931ebc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7016 9956 bytes