Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c276c875a5ca85…

MALICIOUS

PDF

41.3 KB Created: 2020-08-23 06:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bb1ffd52e9f5f42a87f302c3265caee SHA-1: 78c99243d57008c663bc7969920e0d053f92a76e SHA-256: a2c276c875a5ca85c7cf5ef2c687b0d6b66ad4c4ce8e584a64deadb551b42cfe
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=integer+practice+worksheet+pdf, which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text related to an 'integer practice worksheet pdf', suggesting a lure to trick users into clicking the malicious link.

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.cc/pify?keyword=integer+practice+worksheet+pdf
    • http://files.135miles.org/uploads/1/3/1/0/131070559/92a1d3d45c77a59.pdf
    • http://kidokaw.thehoophaven.com/uploads/1/3/0/9/130969940/xadojezitovaf.pdf
    • http://beporojo.heritagefairsns.ca/uploads/1/3/1/0/131070112/aa3fc.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/southwest_airlines_2020_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.pdf
    • https://cdn.shopify.com/s/files/1/0463/2241/7826/files/pugonakofugadoxidejib.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6982/files/vifesireg.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/99678150388.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/jezopeturatilim.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/circular_economy_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/fajekafunozuduvisukes.pdf
    • https://cdn.shopify.com/s/files/1/0461/6755/6259/files/45945914757.pdf
    • https://cdn.shopify.com/s/files/1/0439/5224/2856/files/jelupefafiwadinunixuwez.pdf
    • https://cdn.shopify.com/s/files/1/0440/7800/6437/files/53._544_113._490.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_off000062bc.bin
897aba5395749b5f735b5dd70048047c14f38034391d4b4c1e81bd9ae151a8cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BC 5476 bytes
font_01_sfnt_off00007564.bin
67010dbde75815308ebb40e2e1a0a52c7e3daf25623dfb0fa994d36829647c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7564 10132 bytes

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