Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b5551a4ec1f916…

MALICIOUS

PDF

39.4 KB Created: 2020-08-15 00:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e2107e9d0755cc8adfba61e6b30ee8 SHA-1: c25c01264e9a1d092cc4d2ca872460d3d7d601c4 SHA-256: 28b5551a4ec1f916da998a08214a0d6a089612d8a1a6b005f327e9e156cc3861
128 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for a 'biopsychosocial assessment template'. The presence of a visual download button further supports the social engineering aspect of this attack. The primary goal is to redirect the user to malicious infrastructure.

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.ru/pify?keyword=biopsychosocial+assessment+template+social+work+pdf
    • http://files.dubayhomeinspections.com/uploads/1/3/0/8/130815017/rotew_sutuluzupuri_durimiva.pdf
    • http://files.jessicagardnerdance.com/uploads/1/3/1/4/131438142/629cc84319381.pdf
    • http://xorefuder.violiningaja.com/uploads/1/3/1/3/131383544/53ff83b.pdf
    • http://jorurewi.rubyeyes.com/uploads/1/3/1/3/131384401/0a2dfa8.pdf
    • https://cdn.shopify.com/s/files/1/0437/6667/7655/files/73861876080.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/petavolabegaxenegejetal.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/lipabiximesat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/famulogux.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/batman_arkham_knight_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/37808910563.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/nepali_full_movie_kohinoor.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/pigeka.pdf
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/81302030767.pdf
    • https://cdn.shopify.com/s/files/1/0435/1344/6564/files/fedadufemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4167/files/xunorinomopeweped.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_off00005ba3.bin
0d22202d0e7faa5cac80f8b479da150da9ec028a8b7d33680228fc75a51e19ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA3 5700 bytes
font_01_sfnt_off00006eeb.bin
3afece54ba1f63b8ca402436e6ff0cbbb97c0f5e97422502ed2f39ef182f6d47
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEB 9788 bytes