Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23d8071d39e3daf…

MALICIOUS

PDF

42.8 KB Created: 2020-08-25 12:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff1dcca792926e29898c93b92220e33f SHA-1: d377dbd6dca985995f58a2b525e126d87788d650 SHA-256: a23d8071d39e3dafc23dc2bc512b486aee279e19a5c92dccbee39852ed22d5d3
128 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, with a keyword suggesting a lure for Adobe Flash Player. The document body also contains this URL and references to downloading software, reinforcing the phishing pretext. The presence of a link farm further supports the malicious intent to obscure the final payload delivery.

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=adobe+flash+player+for+firefox+manual+install
    • http://files.workwithpaula.com/uploads/1/3/1/3/131398125/miwukosokufewegijuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/wodigizemelobisizinutoto.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4885/files/30855138317.pdf
    • https://cdn.shopify.com/s/files/1/0438/2156/4066/files/wuxorasoparamizaki.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/56925585285.pdf
    • https://cdn.shopify.com/s/files/1/0435/7423/1199/files/wafumufus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54183348773.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0641/files/nafazokuwixalipak.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/51443486184.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/fukanovisevegifaganitab.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/mossberg_maverick_88_20_gauge_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0431/0184/7708/files/gasebinemafifofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1866/files/reinforced_concrete_materials.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/join_files_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/72351904660.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_off000067c7.bin
620c555114b7b0222b29b750d67eb25cb229444475e09a8ee849d02ebd4e089b
pdf-font-stream PDF embedded font (sfnt) at offset 0x67C7 5580 bytes
font_01_sfnt_off00007a9f.bin
e599a9035dcfff14ee0746cde5ec6b06e45fe6c29aef21d6a124df4c78f3a932
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9F 10364 bytes