Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b12a5ee859126a0…

MALICIOUS

PDF

47.8 KB Created: 2020-07-30 01:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95ec5ed5263110fe9c79fa31221480ff SHA-1: ff254188870ef654a7ed60e9071d3de78485269e SHA-256: 4b12a5ee859126a0ed34195aebb9d714ee0b46e189391bbea254e08e64b322e7
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This link is presented within the document body, disguised as a download for IELTS vocabulary. The document also contains a mass external PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to obscure the malicious destination. The presence of a visual download button further supports the lure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ielts+writing+task+2+vocabulary+pdf+download
    • http://files.ablackrose.org/uploads/1/3/1/4/131452799/jerudamama.pdf
    • http://files.gowersartclass.com/uploads/1/3/1/3/131380687/diroxewulemixom_mopoke.pdf
    • http://files.lane4swimschool.com/uploads/1/3/1/4/131411688/7241983.pdf
    • http://files.hyojinlee.com/uploads/1/3/2/6/132683267/59efc9b23dbf08.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/39257902158.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/xawakuxavuravaridazowu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/vuwixibipad.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2637/files/18066193870.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/sepobusutiwozajulanovo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/29918298600.pdf
    • https://cdn.shopify.com/s/files/1/0429/3014/3395/files/fogabesivulapot.pdf
    • https://cdn.shopify.com/s/files/1/0434/8719/9394/files/44512842692.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/nelisolizamafuzodokur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vakijuxek.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/doxotakubegelotofezado.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/nuwutige.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/81476098254.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/
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/xawak

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b35.bin
075a1cb6e7ce61f5078e2f2d7037c12da15ae4a80632efc68c9b2d158e77af3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B35 5732 bytes
font_01_sfnt_off00008eda.bin
c78f3d8e0de990a021e68d12a19887dfe50af0d322895dac93ae01ac1e54bb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDA 10252 bytes