Malicious PDF — malware analysis report

Static analysis result for SHA-256 523dbddec0111c30…

MALICIOUS

PDF

43.4 KB Created: 2020-08-20 08:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ff8f6833776fdfa30eefa6c0b9aee74 SHA-1: 758324d97d55e379b888c1374a43ad57c3d5711a SHA-256: 523dbddec0111c301f9c5b537e619b48c8232f45b0b0b90ceb463c2fed69a4d8
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a PDF link farm designed to redirect users to malicious infrastructure. No scripts were extracted, but the presence of the malicious redirector URL suggests the intent is to lure users to a compromised site for further exploitation or phishing.

Heuristics 3

  • 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.
  • 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=rnn+bptt+pdf
    • http://kajoz.rightforme.org/uploads/1/3/0/8/130873790/1071e0.pdf
    • http://wafokit.teplomart.cz/uploads/1/3/1/8/131856040/1961528.pdf
    • https://cdn.shopify.com/s/files/1/0434/7192/9496/files/49170086960.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/61082428346.pdf
    • https://cdn.shopify.com/s/files/1/0441/2804/3160/files/virazozuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6851/2669/files/android_studio_3._2._1_logcat_missing.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/halter_top_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3675/files/advanced_cell_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/kepol.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4022/files/17501502991.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2158/files/pogigipavobukefivo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/g_3_residential_building_plan.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/47579891795.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_off0000610d.bin
489680ee48eae300c9ca0ea77dadc34726df9993e68eff2b511cec770ed00840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610D 4668 bytes
font_01_sfnt_off00007100.bin
a3cee3699f62186488e4395b703a4feddb69fc98393d83fc3965f792091800c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7100 14684 bytes

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