Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f475d1c7d31274…

MALICIOUS

PDF

47.2 KB Created: 2020-08-07 00:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29c94868a28ce932817062bcc1b521e9 SHA-1: 8b2db101e190a7848b1e56a00a3d55e248646e97 SHA-256: 85f475d1c7d3127451034d767a44ea05528f00aa734caaf97a45ed390b9560b7
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded link suggest a social engineering lure related to PDF manipulation. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to serve further malicious content.

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/pify?keyword=fusionner+plusieurs+pdf+en+1+seul
    • http://files.havenartistry.com/uploads/1/3/1/4/131483235/10c7f.pdf
    • http://files.nicoleadriennecreative.com/uploads/1/3/1/4/131409309/lubituwe-fevuz-pijufakiv.pdf
    • http://files.cincomediagroup.com/uploads/1/3/1/3/131380754/9b3a8c.pdf
    • http://files.applebrookinn.com/uploads/1/3/0/7/130775200/fusinofowip.pdf
    • http://loguvo.thecommonwealproject.com/uploads/1/3/1/4/131437363/867e12b0168.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/66467397967.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9507/files/favuzudoga.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/9441273692.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/81547164527.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/pile_boring_machine.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/kitevadigiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/7483/7925/files/13144743966.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/bronconeumonia_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0452/4569/4112/files/advanced_cardiovascular_life_support.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/speed_seduction_3._0.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/rojenepelom.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/wevujiwopive.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/case_files_biochemistry_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/90416881798.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_off00007846.bin
babc72f34dc61b666b8de6b8840755c5a1e9e1443c7834e974874e7c5447a95c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7846 4832 bytes
font_01_sfnt_off000088cb.bin
70115395c9c54df43f29abc6392b4769582d61b4f165db9cd1c75e47d72a4947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CB 11668 bytes

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