Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae86bc221bf8d6d…

MALICIOUS

PDF

44.6 KB Created: 2020-09-19 21:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b11082c5071a8b35bfcea9eb4bed42a SHA-1: be846b0ba0eb23484ebe195d2fcfc7344fe37efc SHA-256: 1ae86bc221bf8d6db26337b2ec2ef326d8965b5466cbe0e4f0ed47d47bdb3469
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for redirecting users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that the document is designed to funnel traffic to potentially harmful URLs, disguised with keywords like 'kindergarten teacher introduction letter to parents sample'. The presence of a redirector link and a large number of SEO-optimized PDF links strongly suggests a phishing or malware distribution attempt.

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.link/wix?keyword=kindergarten+teacher+introduction+letter+to+parents+sample
    • http://gipagal.lethbridgeelectrical.com/uploads/1/3/0/7/130776783/079b902.pdf
    • http://files.dmet87.com/uploads/1/3/1/0/131070374/c1d5575f97970ca.pdf
    • http://duxax.mistynielsenphotography.com/uploads/1/3/0/8/130874617/vevuwodi-kemupobuz-digabewixafuze-barazomizi.pdf
    • http://files.natashahoffmanbooks.com/uploads/1/3/1/4/131438313/sarodixe.pdf
    • http://files.semmanuelchambers.com/uploads/1/3/1/4/131407493/6bda171c2a.pdf
    • https://44e8b367-aac6-4b54-9794-8b81787e9110.filesusr.com/ugd/64f9d2_f65f09dad2fe4cba9896fee49a57444a.pdf?index=true
    • https://09aa5add-e984-4327-b960-54832db9def9.filesusr.com/ugd/dbbfd0_3e3444fa6ad44bf4b5c0ae0340139c4d.pdf?index=true
    • https://36f9dca8-c263-48aa-8596-82a67e9f3c47.filesusr.com/ugd/0cd019_ed9f732b0a684550a2981a8a992f31b3.pdf?index=true
    • https://1aba1f5c-ee00-49b1-9f7f-fca32890d74b.filesusr.com/ugd/485053_7d435c5d7fcd4fad8b74d5229b372f71.pdf?index=true
    • https://f86e02cd-898f-485b-9f46-b6e217871c2a.filesusr.com/ugd/11f207_0ddbba132ecc4e16a062696ebf490ab0.pdf?index=true
    • https://359b8e96-a2a3-4949-9248-8229e9f87755.filesusr.com/ugd/21a131_0f03471a2df9418daf930e2dfa7c57ee.pdf?index=true
    • https://d15d7e92-d08f-4839-b42b-478f820624ea.filesusr.com/ugd/868401_2eea73a614be4f81a407ac8d2ce2e9b1.pdf?index=true
    • https://77f28b94-51e3-4c6f-9a48-55d1e53be8f2.filesusr.com/ugd/5b9a87_70c879cf620e4ba992db2e871c6029ce.pdf?index=true
    • 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_off00006248.bin
66f08cf0ea18eba6e5a1a6acf3bf606769b5a8f07f8b23a3d23d74a5b595e507
pdf-font-stream PDF embedded font (sfnt) at offset 0x6248 5336 bytes
font_01_sfnt_off00007436.bin
0291ab607cfeee45c865d6c7d0978c775e54cc76c6122283caa28f395b4ea35e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7436 10220 bytes
font_02_sfnt_off000096ec.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x96EC 4324 bytes