Malicious PDF — malware analysis report

Static analysis result for SHA-256 da47dfd3c3b380ec…

MALICIOUS

PDF

34.9 KB Created: 2020-10-31 22:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9700d814f2f2781672d31d87cca57c4d SHA-1: 9715ce27d7b118815bd6b4b01a8c6de71aa0e2b0 SHA-256: da47dfd3c3b380ec7f37a45c3b1524023601c57b7d78433c5a193b86a4536cfd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious URL identified is https://cctraff.ru/aws?keyword=build+a+food+web+activity+answer+sheet, which is flagged as a known malicious redirector. The document's content, presented as an answer sheet, is a lure to encourage users to click these links, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cctraff.ru/aws?keyword=build+a+food+web+activity+answer+sheet In PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/b7523563575de.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/9160636.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/fe34ed819a.pdfIn PDF document text
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/ginezokivos-xebavod.pdfIn PDF document text
    • https://tovalowu.weebly.com/uploads/1/3/4/3/134375552/gidagimukimexiwuxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb007a3-51f7-4be0-8c24-bf76dd50c089/1388768865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c62f89-fcff-44b5-ac04-7efc79f1bad9/dynamic_character_in_romeo_and_juliet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c04eed-2a24-44a9-98fd-b8e9067c80ba/11737123928.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/17462605787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9bde35-dbb4-4294-ab93-114ed256b730/84168016537.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/fogepolalexirexipuvonone.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/sedizidemebeg.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/basic_grammar_english_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/kilapodevibizaxuduvuriles.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A4F 5552 bytes
SHA-256: 6fb3282ba0c47131f5b9d70a99cb8ff17e59972ad0519a567a6f9d07d5fe1ca3
font_01_sfnt_off00005d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4D 9784 bytes
SHA-256: 48baf2c3d0683cee286793adb596a3a8774a937a3a14021b98508b86dee9ea60

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