Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8340bcc4e48f7c4…

MALICIOUS

PDF

47.0 KB Created: 2020-08-24 05:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1312b74e0073c8bea7da9e525eb024dd SHA-1: bacfa576e650cea5b08f5d3197e950185f2d9747 SHA-256: c8340bcc4e48f7c47f50f3e3b0d1d7ad35c54dc681213c7f1a7d5fb3ce487bcb
128 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, characteristic of a link farm. One critical heuristic identified a malicious redirector link, suggesting the document is designed to lure users to malicious sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted from this sample.

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=legacy+charting+companion+free
    • http://dawok.schifferpublishingltd.com/uploads/1/3/1/4/131406893/911dbaf48516dfc.pdf
    • http://files.trinitysecurityallies.com/uploads/1/3/2/7/132740361/wavubalefariruse.pdf
    • http://zozap.nancyamchugh.org/uploads/1/3/2/6/132680813/7444132.pdf
    • http://files.createdheavens.com/uploads/1/3/0/7/130775292/firapusikojosed_zekonifebuzexak_pixigekuxiw_serudumer.pdf
    • http://files.ranchochamber.org/uploads/1/3/2/6/132680890/a1bb11.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2166/files/pujupufekugevivejefev.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6351/files/25787286521.pdf
    • https://cdn.shopify.com/s/files/1/0437/0006/0310/files/49978760970.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2533/files/raxevuwukobufifiwolimos.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2230/files/apache_car_game.pdf
    • https://cdn.shopify.com/s/files/1/0432/8833/0396/files/application_store_apple.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/bizigox.pdf
    • https://cdn.shopify.com/s/files/1/0444/5034/9223/files/free_offline_english_dictionary_for_laptop.pdf
    • https://cdn.shopify.com/s/files/1/0430/4198/0567/files/4507408210.pdf
    • https://cdn.shopify.com/s/files/1/0432/9721/0532/files/54840057873.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3688/files/vscode_format_document_indent.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_off000063d3.bin
e31a16dea6d95dc086298b271ca00a3e0e213b9d33de1a4e7b8695800d286d42
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 5260 bytes
font_01_sfnt_off000075a0.bin
a8ffc934bc614fb0768525a43c93b29db64a5e7611aa44a4f67aa9c955965794
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A0 10488 bytes
font_02_sfnt_off00009937.bin
9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189
pdf-font-stream PDF embedded font (sfnt) at offset 0x9937 16344 bytes