Malicious PDF — malware analysis report

Static analysis result for SHA-256 2508fddeba3f36c9…

MALICIOUS

PDF

38.1 KB Created: 2020-08-25 15:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5624722768aa2f0d00d44deee5f62d77 SHA-1: 603a899ebee578adaa67aad8f2e60bea156afcf9 SHA-256: 2508fddeba3f36c9ba9278c19732aa5a61b273ba2e249899daaf7ba8e5a0f9f5
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, with one identified as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting it is a 'hsk 2 workbook answer', likely a lure. The presence of a malicious redirector indicates an attempt to lead the user to a harmful site, potentially for credential harvesting or further malware delivery. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.com/pify?keyword=hsk+2+workbook+answer
    • http://files.andrewmichaelart.com/uploads/1/3/1/4/131408529/59fa416c9cccb3.pdf
    • http://files.paulsfranchiseleague.com/uploads/1/3/1/4/131438249/kabuvoxije_kuvorenuzixuw_raxejusub.pdf
    • https://cdn.shopify.com/s/files/1/0439/8612/4958/files/kepavuguwudupeb.pdf
    • https://cdn.shopify.com/s/files/1/0445/6543/0431/files/chemistry_11th_book_state_board.pdf
    • https://cdn.shopify.com/s/files/1/0440/5110/3894/files/tegakuxuseka.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6719/files/fancy_letter_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/fizabefepuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/aristotle_on_democracy.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/grafomotricidad_abecedario_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0160/1444/files/50102226821.pdf
    • https://cdn.shopify.com/s/files/1/0431/3818/7413/files/turbulance_fd_c4d_torrent_mac.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5798/files/mimazekojisusi.pdf
    • https://cdn.shopify.com/s/files/1/0440/0028/0726/files/cinema_camera_angles.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/67256100121.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/38706357578.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000476c.bin
f140f7845d6838cfbe66012526faa3c39ec0777be1baf188dfbb429abd16325e
pdf-font-stream PDF embedded font (sfnt) at offset 0x476C 4864 bytes
font_01_sfnt_off0000584f.bin
7c05eeb09fc7ac088bf230a59ee55a0bd815570f62807f846d080b8862a7a157
pdf-font-stream PDF embedded font (sfnt) at offset 0x584F 5036 bytes
font_02_sfnt_off0000698c.bin
ce84c299c6fb5437489fd8c8f15bc3c2726c960cd3f1298b0fab5e09d051ce0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x698C 9520 bytes