Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6737bc1a1a40fae…

MALICIOUS

PDF

42.5 KB Created: 2020-08-15 05:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78cd83b0739fa09bb43b15e7f0c37022 SHA-1: 9431565a7a4c0b849a072ee514ce01ffca1ac634 SHA-256: a6737bc1a1a40fae73829b65974cee376b469404ea8d75990e3a6f9374704857
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=months+of+the+year+in+order+worksheet', suggesting a lure to a malicious site. The presence of multiple benign-looking Shopify links alongside the malicious one is a common tactic to mask malicious intent.

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.ru/pify?keyword=months+of+the+year+in+order+worksheet
    • http://files.anthonybosman.com/uploads/1/3/1/8/131871416/kixitu-sunonu.pdf
    • http://files.iamadamgreenfield.com/uploads/1/3/1/4/131411474/munulaz-lumewo-garupufefase-zomixonapuwife.pdf
    • http://kixekuxu.sridevi.org/uploads/1/3/0/8/130814328/4893323.pdf
    • http://nijekob.dutchesshousepatterns.com/uploads/1/3/2/8/132814930/b051f217eaf8d3.pdf
    • http://wuxasir.sunbirdtravels.com/uploads/1/3/2/8/132814930/3108425.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/77980585726.pdf
    • https://cdn.shopify.com/s/files/1/0455/7471/7605/files/printable_applebee_s_menu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/210599405.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/70482643997.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/1880963162.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/61768931519.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5447/files/lutezejufir.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2659/files/97505486060.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/cassation_decision_volume_13.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_off000068bb.bin
d6d33abe4b88d74231c59fff650a7e5d5902e3afb4a5e4f0aeb0c005af562ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BB 5224 bytes
font_01_sfnt_off00007a9b.bin
9d2a9ea171377064d76b0da56338444712a709064b3114ba91c49db937ccd778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9B 10104 bytes

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